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📝 Worksheet 3 of 10 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Beginner level

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Question 1

Deepa says: 'The number of liars among us is exactly one' Farhan says: 'Deepa and Rahul are the same type' Rahul says: 'At least one of us is a truth-teller' If the initial correct deduction shows Deepa is a Truth-teller, but we hypothetically assume Deepa was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Deepa is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Deepa and Rahul same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Deepa=T, Farhan=T, Rahul=L

Now, hypothetically assume Deepa is liar instead of truth-teller.
Then we need to re-solve:
- Deepa liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Deepa truth - contradicts Deepa liar.
- If 2 liars, then Farhan and Rahul are liars. Then Farhan liar says 'Deepa and Rahul same type' - Deepa liar, Rahul liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Farhan liar says 'Deepa and Rahul same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Deepa is liar.
Thus, if we hypothetically assume Deepa is liar, there would be ZERO truth-tellers.

Question 2

Gaurav says: 'The number of liars among us is exactly one' Rohan says: 'Gaurav and Ravi are the same type' Ravi says: 'At least one of us is a truth-teller' If the initial correct deduction shows Gaurav is a Truth-teller, but we hypothetically assume Gaurav was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Gaurav is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Gaurav and Ravi same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Gaurav=T, Rohan=T, Ravi=L

Now, hypothetically assume Gaurav is liar instead of truth-teller.
Then we need to re-solve:
- Gaurav liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Gaurav truth - contradicts Gaurav liar.
- If 2 liars, then Rohan and Ravi are liars. Then Rohan liar says 'Gaurav and Ravi same type' - Gaurav liar, Ravi liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Rohan liar says 'Gaurav and Ravi same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Gaurav is liar.
Thus, if we hypothetically assume Gaurav is liar, there would be ZERO truth-tellers.

Question 3

Rahul says: 'The number of liars among us is exactly one' Vikram says: 'Rahul and Priya are the same type' Priya says: 'At least one of us is a truth-teller' If the initial correct deduction shows Rahul is a Truth-teller, but we hypothetically assume Rahul was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Rahul is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Rahul and Priya same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Rahul=T, Vikram=T, Priya=L

Now, hypothetically assume Rahul is liar instead of truth-teller.
Then we need to re-solve:
- Rahul liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Rahul truth - contradicts Rahul liar.
- If 2 liars, then Vikram and Priya are liars. Then Vikram liar says 'Rahul and Priya same type' - Rahul liar, Priya liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Vikram liar says 'Rahul and Priya same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Rahul is liar.
Thus, if we hypothetically assume Rahul is liar, there would be ZERO truth-tellers.

Question 4

Kiran says: 'The number of liars among us is exactly one' Gaurav says: 'Kiran and Vikram are the same type' Vikram says: 'At least one of us is a truth-teller' If the initial correct deduction shows Kiran is a Truth-teller, but we hypothetically assume Kiran was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Kiran is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Kiran and Vikram same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Kiran=T, Gaurav=T, Vikram=L

Now, hypothetically assume Kiran is liar instead of truth-teller.
Then we need to re-solve:
- Kiran liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Kiran truth - contradicts Kiran liar.
- If 2 liars, then Gaurav and Vikram are liars. Then Gaurav liar says 'Kiran and Vikram same type' - Kiran liar, Vikram liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Gaurav liar says 'Kiran and Vikram same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Kiran is liar.
Thus, if we hypothetically assume Kiran is liar, there would be ZERO truth-tellers.

Question 5

Priya says: 'The number of liars among us is exactly one' Rahul says: 'Priya and Sanjay are the same type' Sanjay says: 'At least one of us is a truth-teller' If the initial correct deduction shows Priya is a Truth-teller, but we hypothetically assume Priya was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Priya is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Priya and Sanjay same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Priya=T, Rahul=T, Sanjay=L

Now, hypothetically assume Priya is liar instead of truth-teller.
Then we need to re-solve:
- Priya liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Priya truth - contradicts Priya liar.
- If 2 liars, then Rahul and Sanjay are liars. Then Rahul liar says 'Priya and Sanjay same type' - Priya liar, Sanjay liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Rahul liar says 'Priya and Sanjay same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Priya is liar.
Thus, if we hypothetically assume Priya is liar, there would be ZERO truth-tellers.

Question 6

Vikram says: 'The number of liars among us is exactly one' Priya says: 'Vikram and Farhan are the same type' Farhan says: 'At least one of us is a truth-teller' If the initial correct deduction shows Vikram is a Truth-teller, but we hypothetically assume Vikram was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Vikram is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Vikram and Farhan same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Vikram=T, Priya=T, Farhan=L

Now, hypothetically assume Vikram is liar instead of truth-teller.
Then we need to re-solve:
- Vikram liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Vikram truth - contradicts Vikram liar.
- If 2 liars, then Priya and Farhan are liars. Then Priya liar says 'Vikram and Farhan same type' - Vikram liar, Farhan liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Priya liar says 'Vikram and Farhan same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Vikram is liar.
Thus, if we hypothetically assume Vikram is liar, there would be ZERO truth-tellers.

Question 7

Gaurav says: 'The number of liars among us is exactly one' Sanjay says: 'Gaurav and Kiran are the same type' Kiran says: 'At least one of us is a truth-teller' If the initial correct deduction shows Gaurav is a Truth-teller, but we hypothetically assume Gaurav was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Gaurav is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Gaurav and Kiran same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Gaurav=T, Sanjay=T, Kiran=L

Now, hypothetically assume Gaurav is liar instead of truth-teller.
Then we need to re-solve:
- Gaurav liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Gaurav truth - contradicts Gaurav liar.
- If 2 liars, then Sanjay and Kiran are liars. Then Sanjay liar says 'Gaurav and Kiran same type' - Gaurav liar, Kiran liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Sanjay liar says 'Gaurav and Kiran same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Gaurav is liar.
Thus, if we hypothetically assume Gaurav is liar, there would be ZERO truth-tellers.

Question 8

Leena says: 'The number of liars among us is exactly one' Rohan says: 'Leena and Kiran are the same type' Kiran says: 'At least one of us is a truth-teller' If the initial correct deduction shows Leena is a Truth-teller, but we hypothetically assume Leena was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Leena is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Leena and Kiran same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Leena=T, Rohan=T, Kiran=L

Now, hypothetically assume Leena is liar instead of truth-teller.
Then we need to re-solve:
- Leena liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Leena truth - contradicts Leena liar.
- If 2 liars, then Rohan and Kiran are liars. Then Rohan liar says 'Leena and Kiran same type' - Leena liar, Kiran liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Rohan liar says 'Leena and Kiran same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Leena is liar.
Thus, if we hypothetically assume Leena is liar, there would be ZERO truth-tellers.

Question 9

Priya says: 'The number of liars among us is exactly one' Amit says: 'Priya and Deepa are the same type' Deepa says: 'At least one of us is a truth-teller' If the initial correct deduction shows Priya is a Truth-teller, but we hypothetically assume Priya was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Priya is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Priya and Deepa same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Priya=T, Amit=T, Deepa=L

Now, hypothetically assume Priya is liar instead of truth-teller.
Then we need to re-solve:
- Priya liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Priya truth - contradicts Priya liar.
- If 2 liars, then Amit and Deepa are liars. Then Amit liar says 'Priya and Deepa same type' - Priya liar, Deepa liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Amit liar says 'Priya and Deepa same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Priya is liar.
Thus, if we hypothetically assume Priya is liar, there would be ZERO truth-tellers.

Question 10

Priya says: 'The number of liars among us is exactly one' Vikram says: 'Priya and Neha are the same type' Neha says: 'At least one of us is a truth-teller' If the initial correct deduction shows Priya is a Truth-teller, but we hypothetically assume Priya was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Priya is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Priya and Neha same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Priya=T, Vikram=T, Neha=L

Now, hypothetically assume Priya is liar instead of truth-teller.
Then we need to re-solve:
- Priya liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Priya truth - contradicts Priya liar.
- If 2 liars, then Vikram and Neha are liars. Then Vikram liar says 'Priya and Neha same type' - Priya liar, Neha liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Vikram liar says 'Priya and Neha same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Priya is liar.
Thus, if we hypothetically assume Priya is liar, there would be ZERO truth-tellers.

Question 11

Deepa says: 'The number of liars among us is exactly one' Leena says: 'Deepa and Vikram are the same type' Vikram says: 'At least one of us is a truth-teller' If the initial correct deduction shows Deepa is a Truth-teller, but we hypothetically assume Deepa was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Deepa is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Deepa and Vikram same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Deepa=T, Leena=T, Vikram=L

Now, hypothetically assume Deepa is liar instead of truth-teller.
Then we need to re-solve:
- Deepa liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Deepa truth - contradicts Deepa liar.
- If 2 liars, then Leena and Vikram are liars. Then Leena liar says 'Deepa and Vikram same type' - Deepa liar, Vikram liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Leena liar says 'Deepa and Vikram same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Deepa is liar.
Thus, if we hypothetically assume Deepa is liar, there would be ZERO truth-tellers.

Question 12

Gaurav says: 'The number of liars among us is exactly one' Sanjay says: 'Gaurav and Kiran are the same type' Kiran says: 'At least one of us is a truth-teller' If the initial correct deduction shows Gaurav is a Truth-teller, but we hypothetically assume Gaurav was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Gaurav is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Gaurav and Kiran same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Gaurav=T, Sanjay=T, Kiran=L

Now, hypothetically assume Gaurav is liar instead of truth-teller.
Then we need to re-solve:
- Gaurav liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Gaurav truth - contradicts Gaurav liar.
- If 2 liars, then Sanjay and Kiran are liars. Then Sanjay liar says 'Gaurav and Kiran same type' - Gaurav liar, Kiran liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Sanjay liar says 'Gaurav and Kiran same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Gaurav is liar.
Thus, if we hypothetically assume Gaurav is liar, there would be ZERO truth-tellers.

Question 13

Pooja says: 'The number of liars among us is exactly one' Leena says: 'Pooja and Rohan are the same type' Rohan says: 'At least one of us is a truth-teller' If the initial correct deduction shows Pooja is a Truth-teller, but we hypothetically assume Pooja was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Pooja is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Pooja and Rohan same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Pooja=T, Leena=T, Rohan=L

Now, hypothetically assume Pooja is liar instead of truth-teller.
Then we need to re-solve:
- Pooja liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Pooja truth - contradicts Pooja liar.
- If 2 liars, then Leena and Rohan are liars. Then Leena liar says 'Pooja and Rohan same type' - Pooja liar, Rohan liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Leena liar says 'Pooja and Rohan same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Pooja is liar.
Thus, if we hypothetically assume Pooja is liar, there would be ZERO truth-tellers.

Question 14

Leena says: 'The number of liars among us is exactly one' Rahul says: 'Leena and Harsha are the same type' Harsha says: 'At least one of us is a truth-teller' If the initial correct deduction shows Leena is a Truth-teller, but we hypothetically assume Leena was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Leena is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Leena and Harsha same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Leena=T, Rahul=T, Harsha=L

Now, hypothetically assume Leena is liar instead of truth-teller.
Then we need to re-solve:
- Leena liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Leena truth - contradicts Leena liar.
- If 2 liars, then Rahul and Harsha are liars. Then Rahul liar says 'Leena and Harsha same type' - Leena liar, Harsha liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Rahul liar says 'Leena and Harsha same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Leena is liar.
Thus, if we hypothetically assume Leena is liar, there would be ZERO truth-tellers.

Question 15

Kiran says: 'The number of liars among us is exactly one' Amit says: 'Kiran and Vikram are the same type' Vikram says: 'At least one of us is a truth-teller' If the initial correct deduction shows Kiran is a Truth-teller, but we hypothetically assume Kiran was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Kiran is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Kiran and Vikram same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Kiran=T, Amit=T, Vikram=L

Now, hypothetically assume Kiran is liar instead of truth-teller.
Then we need to re-solve:
- Kiran liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Kiran truth - contradicts Kiran liar.
- If 2 liars, then Amit and Vikram are liars. Then Amit liar says 'Kiran and Vikram same type' - Kiran liar, Vikram liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Amit liar says 'Kiran and Vikram same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Kiran is liar.
Thus, if we hypothetically assume Kiran is liar, there would be ZERO truth-tellers.

Question 16

Sanjay says: 'The number of liars among us is exactly one' Deepa says: 'Sanjay and Leena are the same type' Leena says: 'At least one of us is a truth-teller' If the initial correct deduction shows Sanjay is a Truth-teller, but we hypothetically assume Sanjay was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Sanjay is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Sanjay and Leena same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Sanjay=T, Deepa=T, Leena=L

Now, hypothetically assume Sanjay is liar instead of truth-teller.
Then we need to re-solve:
- Sanjay liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Sanjay truth - contradicts Sanjay liar.
- If 2 liars, then Deepa and Leena are liars. Then Deepa liar says 'Sanjay and Leena same type' - Sanjay liar, Leena liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Deepa liar says 'Sanjay and Leena same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Sanjay is liar.
Thus, if we hypothetically assume Sanjay is liar, there would be ZERO truth-tellers.

Question 17

Leena says: 'The number of liars among us is exactly one' Rohan says: 'Leena and Neha are the same type' Neha says: 'At least one of us is a truth-teller' If the initial correct deduction shows Leena is a Truth-teller, but we hypothetically assume Leena was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Leena is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Leena and Neha same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Leena=T, Rohan=T, Neha=L

Now, hypothetically assume Leena is liar instead of truth-teller.
Then we need to re-solve:
- Leena liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Leena truth - contradicts Leena liar.
- If 2 liars, then Rohan and Neha are liars. Then Rohan liar says 'Leena and Neha same type' - Leena liar, Neha liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Rohan liar says 'Leena and Neha same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Leena is liar.
Thus, if we hypothetically assume Leena is liar, there would be ZERO truth-tellers.

Question 18

Anita says: 'The number of liars among us is exactly one' Sunil says: 'Anita and Priya are the same type' Priya says: 'At least one of us is a truth-teller' If the initial correct deduction shows Anita is a Truth-teller, but we hypothetically assume Anita was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Anita is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Anita and Priya same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Anita=T, Sunil=T, Priya=L

Now, hypothetically assume Anita is liar instead of truth-teller.
Then we need to re-solve:
- Anita liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Anita truth - contradicts Anita liar.
- If 2 liars, then Sunil and Priya are liars. Then Sunil liar says 'Anita and Priya same type' - Anita liar, Priya liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Sunil liar says 'Anita and Priya same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Anita is liar.
Thus, if we hypothetically assume Anita is liar, there would be ZERO truth-tellers.

Question 19

Divya says: 'The number of liars among us is exactly one' Vikram says: 'Divya and Kiran are the same type' Kiran says: 'At least one of us is a truth-teller' If the initial correct deduction shows Divya is a Truth-teller, but we hypothetically assume Divya was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Divya is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Divya and Kiran same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Divya=T, Vikram=T, Kiran=L

Now, hypothetically assume Divya is liar instead of truth-teller.
Then we need to re-solve:
- Divya liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Divya truth - contradicts Divya liar.
- If 2 liars, then Vikram and Kiran are liars. Then Vikram liar says 'Divya and Kiran same type' - Divya liar, Kiran liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Vikram liar says 'Divya and Kiran same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Divya is liar.
Thus, if we hypothetically assume Divya is liar, there would be ZERO truth-tellers.

Question 20

Pooja says: 'The number of liars among us is exactly one' Neha says: 'Pooja and Ravi are the same type' Ravi says: 'At least one of us is a truth-teller' If the initial correct deduction shows Pooja is a Truth-teller, but we hypothetically assume Pooja was a Liar, how many Truth-tellers would there be?
First, solve the original puzzle:
- If Pooja is truth-teller -> exactly one liar -> p2 and p3 are truth-tellers.
Then p2 (truth) says 'Pooja and Ravi same type' - true (both truth) - consistent.
p3 (truth) says 'at least one truth-teller' - true - consistent.
Solution: Pooja=T, Neha=T, Ravi=L

Now, hypothetically assume Pooja is liar instead of truth-teller.
Then we need to re-solve:
- Pooja liar -> statement 1 false -> number of liars is NOT exactly one -> 0, 2, or 3 liars.
- If 0 liars, all truth-tellers. Then Pooja truth - contradicts Pooja liar.
- If 2 liars, then Neha and Ravi are liars. Then Neha liar says 'Pooja and Ravi same type' - Pooja liar, Ravi liar -> same type -> true statement, but liar can't make true - contradiction.
- If 3 liars, all are liars. Then Neha liar says 'Pooja and Ravi same type' - both liars -> same -> true statement - contradiction.
- Therefore, no consistent assignment exists when Pooja is liar.
Thus, if we hypothetically assume Pooja is liar, there would be ZERO truth-tellers.
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