two_person_accusation - Absolute-Beginner Level: core concept mastery two_person_accusation ABSOLUTE BEGINNER

This skill primer 🌟 worksheet focuses on two_person_accusation - a key topic in Binary Logic. You'll solve 20 absolute-beginner-level problems (Worksheet 1 of 10). The primary focus is on core concept mastery. Master two_person_accusation problems, two_person_accusation reasoning questions, and two_person_accusation practice through systematic practice.

📝 Worksheet 1 of 10 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Absolute Beginner level

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Your progress through two_person_accusation
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Question 1

Manoj says: 'Sanjay is a liar' Sanjay says: 'Sunil is a liar' Sunil says: 'Manoj is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Sunil is a liar.
→ Sunil's statement 'Manoj is a truth-teller' is FALSE → Manoj is a liar.
→ Sanjay says 'Sunil is a liar' - this is TRUE (since Sunil is liar).
→ If Sanjay tells truth, then Sanjay is truth-teller.
→ Manoj (liar) says 'Sanjay is a liar' - FALSE (since Sanjay is truth) → consistent.
This gives: Manoj=L, Sanjay=T, Sunil=L (two liars, one truth-teller).

Step 2: Assume Sunil is a truth-teller.
→ Sunil's statement 'Manoj is a truth-teller' is TRUE → Manoj is truth-teller.
→ Manoj (truth) says 'Sanjay is a liar' → TRUE → Sanjay is liar.
→ Sanjay (liar) says 'Sunil is a liar' - FALSE (since Sunil is truth) → consistent.
This gives: Manoj=T, Sanjay=L, Sunil=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Sunil also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Manoj and Sunil are truth-tellers, Sanjay is a liar.

Question 2

Divya says: 'Ravi is a liar' Ravi says: 'Amit is a liar' Amit says: 'Divya is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Amit is a liar.
→ Amit's statement 'Divya is a truth-teller' is FALSE → Divya is a liar.
→ Ravi says 'Amit is a liar' - this is TRUE (since Amit is liar).
→ If Ravi tells truth, then Ravi is truth-teller.
→ Divya (liar) says 'Ravi is a liar' - FALSE (since Ravi is truth) → consistent.
This gives: Divya=L, Ravi=T, Amit=L (two liars, one truth-teller).

Step 2: Assume Amit is a truth-teller.
→ Amit's statement 'Divya is a truth-teller' is TRUE → Divya is truth-teller.
→ Divya (truth) says 'Ravi is a liar' → TRUE → Ravi is liar.
→ Ravi (liar) says 'Amit is a liar' - FALSE (since Amit is truth) → consistent.
This gives: Divya=T, Ravi=L, Amit=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Amit also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Divya and Amit are truth-tellers, Ravi is a liar.

Question 3

Gaurav says: 'Anita is a liar' Anita says: 'Amit is a liar' Amit says: 'Gaurav is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Amit is a liar.
→ Amit's statement 'Gaurav is a truth-teller' is FALSE → Gaurav is a liar.
→ Anita says 'Amit is a liar' - this is TRUE (since Amit is liar).
→ If Anita tells truth, then Anita is truth-teller.
→ Gaurav (liar) says 'Anita is a liar' - FALSE (since Anita is truth) → consistent.
This gives: Gaurav=L, Anita=T, Amit=L (two liars, one truth-teller).

Step 2: Assume Amit is a truth-teller.
→ Amit's statement 'Gaurav is a truth-teller' is TRUE → Gaurav is truth-teller.
→ Gaurav (truth) says 'Anita is a liar' → TRUE → Anita is liar.
→ Anita (liar) says 'Amit is a liar' - FALSE (since Amit is truth) → consistent.
This gives: Gaurav=T, Anita=L, Amit=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Amit also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Gaurav and Amit are truth-tellers, Anita is a liar.

Question 4

Sanjay says: 'Leena is a liar' Leena says: 'Neha is a liar' Neha says: 'Sanjay is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Neha is a liar.
→ Neha's statement 'Sanjay is a truth-teller' is FALSE → Sanjay is a liar.
→ Leena says 'Neha is a liar' - this is TRUE (since Neha is liar).
→ If Leena tells truth, then Leena is truth-teller.
→ Sanjay (liar) says 'Leena is a liar' - FALSE (since Leena is truth) → consistent.
This gives: Sanjay=L, Leena=T, Neha=L (two liars, one truth-teller).

Step 2: Assume Neha is a truth-teller.
→ Neha's statement 'Sanjay is a truth-teller' is TRUE → Sanjay is truth-teller.
→ Sanjay (truth) says 'Leena is a liar' → TRUE → Leena is liar.
→ Leena (liar) says 'Neha is a liar' - FALSE (since Neha is truth) → consistent.
This gives: Sanjay=T, Leena=L, Neha=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Neha also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Sanjay and Neha are truth-tellers, Leena is a liar.

Question 5

Pooja says: 'Farhan is a liar' Farhan says: 'Vikram is a liar' Vikram says: 'Pooja is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Vikram is a liar.
→ Vikram's statement 'Pooja is a truth-teller' is FALSE → Pooja is a liar.
→ Farhan says 'Vikram is a liar' - this is TRUE (since Vikram is liar).
→ If Farhan tells truth, then Farhan is truth-teller.
→ Pooja (liar) says 'Farhan is a liar' - FALSE (since Farhan is truth) → consistent.
This gives: Pooja=L, Farhan=T, Vikram=L (two liars, one truth-teller).

Step 2: Assume Vikram is a truth-teller.
→ Vikram's statement 'Pooja is a truth-teller' is TRUE → Pooja is truth-teller.
→ Pooja (truth) says 'Farhan is a liar' → TRUE → Farhan is liar.
→ Farhan (liar) says 'Vikram is a liar' - FALSE (since Vikram is truth) → consistent.
This gives: Pooja=T, Farhan=L, Vikram=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Vikram also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Pooja and Vikram are truth-tellers, Farhan is a liar.

Question 6

Amit says: 'Farhan is a liar' Farhan says: 'Leena is a liar' Leena says: 'Amit is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Leena is a liar.
→ Leena's statement 'Amit is a truth-teller' is FALSE → Amit is a liar.
→ Farhan says 'Leena is a liar' - this is TRUE (since Leena is liar).
→ If Farhan tells truth, then Farhan is truth-teller.
→ Amit (liar) says 'Farhan is a liar' - FALSE (since Farhan is truth) → consistent.
This gives: Amit=L, Farhan=T, Leena=L (two liars, one truth-teller).

Step 2: Assume Leena is a truth-teller.
→ Leena's statement 'Amit is a truth-teller' is TRUE → Amit is truth-teller.
→ Amit (truth) says 'Farhan is a liar' → TRUE → Farhan is liar.
→ Farhan (liar) says 'Leena is a liar' - FALSE (since Leena is truth) → consistent.
This gives: Amit=T, Farhan=L, Leena=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Leena also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Amit and Leena are truth-tellers, Farhan is a liar.

Question 7

Sanjay says: 'Meera is a liar' Meera says: 'Anita is a liar' Anita says: 'Sanjay is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Anita is a liar.
→ Anita's statement 'Sanjay is a truth-teller' is FALSE → Sanjay is a liar.
→ Meera says 'Anita is a liar' - this is TRUE (since Anita is liar).
→ If Meera tells truth, then Meera is truth-teller.
→ Sanjay (liar) says 'Meera is a liar' - FALSE (since Meera is truth) → consistent.
This gives: Sanjay=L, Meera=T, Anita=L (two liars, one truth-teller).

Step 2: Assume Anita is a truth-teller.
→ Anita's statement 'Sanjay is a truth-teller' is TRUE → Sanjay is truth-teller.
→ Sanjay (truth) says 'Meera is a liar' → TRUE → Meera is liar.
→ Meera (liar) says 'Anita is a liar' - FALSE (since Anita is truth) → consistent.
This gives: Sanjay=T, Meera=L, Anita=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Anita also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Sanjay and Anita are truth-tellers, Meera is a liar.

Question 8

Kiran says: 'Divya is a liar' Divya says: 'Neha is a liar' Neha says: 'Kiran is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Neha is a liar.
→ Neha's statement 'Kiran is a truth-teller' is FALSE → Kiran is a liar.
→ Divya says 'Neha is a liar' - this is TRUE (since Neha is liar).
→ If Divya tells truth, then Divya is truth-teller.
→ Kiran (liar) says 'Divya is a liar' - FALSE (since Divya is truth) → consistent.
This gives: Kiran=L, Divya=T, Neha=L (two liars, one truth-teller).

Step 2: Assume Neha is a truth-teller.
→ Neha's statement 'Kiran is a truth-teller' is TRUE → Kiran is truth-teller.
→ Kiran (truth) says 'Divya is a liar' → TRUE → Divya is liar.
→ Divya (liar) says 'Neha is a liar' - FALSE (since Neha is truth) → consistent.
This gives: Kiran=T, Divya=L, Neha=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Neha also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Kiran and Neha are truth-tellers, Divya is a liar.

Question 9

Harsha says: 'Amit is a liar' Amit says: 'Anita is a liar' Anita says: 'Harsha is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Anita is a liar.
→ Anita's statement 'Harsha is a truth-teller' is FALSE → Harsha is a liar.
→ Amit says 'Anita is a liar' - this is TRUE (since Anita is liar).
→ If Amit tells truth, then Amit is truth-teller.
→ Harsha (liar) says 'Amit is a liar' - FALSE (since Amit is truth) → consistent.
This gives: Harsha=L, Amit=T, Anita=L (two liars, one truth-teller).

Step 2: Assume Anita is a truth-teller.
→ Anita's statement 'Harsha is a truth-teller' is TRUE → Harsha is truth-teller.
→ Harsha (truth) says 'Amit is a liar' → TRUE → Amit is liar.
→ Amit (liar) says 'Anita is a liar' - FALSE (since Anita is truth) → consistent.
This gives: Harsha=T, Amit=L, Anita=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Anita also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Harsha and Anita are truth-tellers, Amit is a liar.

Question 10

Rahul says: 'Rohan is a liar' Rohan says: 'Meera is a liar' Meera says: 'Rahul is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Meera is a liar.
→ Meera's statement 'Rahul is a truth-teller' is FALSE → Rahul is a liar.
→ Rohan says 'Meera is a liar' - this is TRUE (since Meera is liar).
→ If Rohan tells truth, then Rohan is truth-teller.
→ Rahul (liar) says 'Rohan is a liar' - FALSE (since Rohan is truth) → consistent.
This gives: Rahul=L, Rohan=T, Meera=L (two liars, one truth-teller).

Step 2: Assume Meera is a truth-teller.
→ Meera's statement 'Rahul is a truth-teller' is TRUE → Rahul is truth-teller.
→ Rahul (truth) says 'Rohan is a liar' → TRUE → Rohan is liar.
→ Rohan (liar) says 'Meera is a liar' - FALSE (since Meera is truth) → consistent.
This gives: Rahul=T, Rohan=L, Meera=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Meera also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Rahul and Meera are truth-tellers, Rohan is a liar.

Question 11

Farhan says: 'Deepa is a liar' Deepa says: 'Divya is a liar' Divya says: 'Farhan is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Divya is a liar.
→ Divya's statement 'Farhan is a truth-teller' is FALSE → Farhan is a liar.
→ Deepa says 'Divya is a liar' - this is TRUE (since Divya is liar).
→ If Deepa tells truth, then Deepa is truth-teller.
→ Farhan (liar) says 'Deepa is a liar' - FALSE (since Deepa is truth) → consistent.
This gives: Farhan=L, Deepa=T, Divya=L (two liars, one truth-teller).

Step 2: Assume Divya is a truth-teller.
→ Divya's statement 'Farhan is a truth-teller' is TRUE → Farhan is truth-teller.
→ Farhan (truth) says 'Deepa is a liar' → TRUE → Deepa is liar.
→ Deepa (liar) says 'Divya is a liar' - FALSE (since Divya is truth) → consistent.
This gives: Farhan=T, Deepa=L, Divya=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Divya also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Farhan and Divya are truth-tellers, Deepa is a liar.

Question 12

Ravi says: 'Rohan is a liar' Rohan says: 'Sunil is a liar' Sunil says: 'Ravi is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Sunil is a liar.
→ Sunil's statement 'Ravi is a truth-teller' is FALSE → Ravi is a liar.
→ Rohan says 'Sunil is a liar' - this is TRUE (since Sunil is liar).
→ If Rohan tells truth, then Rohan is truth-teller.
→ Ravi (liar) says 'Rohan is a liar' - FALSE (since Rohan is truth) → consistent.
This gives: Ravi=L, Rohan=T, Sunil=L (two liars, one truth-teller).

Step 2: Assume Sunil is a truth-teller.
→ Sunil's statement 'Ravi is a truth-teller' is TRUE → Ravi is truth-teller.
→ Ravi (truth) says 'Rohan is a liar' → TRUE → Rohan is liar.
→ Rohan (liar) says 'Sunil is a liar' - FALSE (since Sunil is truth) → consistent.
This gives: Ravi=T, Rohan=L, Sunil=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Sunil also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Ravi and Sunil are truth-tellers, Rohan is a liar.

Question 13

Farhan says: 'Priya is a liar' Priya says: 'Pooja is a liar' Pooja says: 'Farhan is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Pooja is a liar.
→ Pooja's statement 'Farhan is a truth-teller' is FALSE → Farhan is a liar.
→ Priya says 'Pooja is a liar' - this is TRUE (since Pooja is liar).
→ If Priya tells truth, then Priya is truth-teller.
→ Farhan (liar) says 'Priya is a liar' - FALSE (since Priya is truth) → consistent.
This gives: Farhan=L, Priya=T, Pooja=L (two liars, one truth-teller).

Step 2: Assume Pooja is a truth-teller.
→ Pooja's statement 'Farhan is a truth-teller' is TRUE → Farhan is truth-teller.
→ Farhan (truth) says 'Priya is a liar' → TRUE → Priya is liar.
→ Priya (liar) says 'Pooja is a liar' - FALSE (since Pooja is truth) → consistent.
This gives: Farhan=T, Priya=L, Pooja=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Pooja also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Farhan and Pooja are truth-tellers, Priya is a liar.

Question 14

Manoj says: 'Priya is a liar' Priya says: 'Amit is a liar' Amit says: 'Manoj is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Amit is a liar.
→ Amit's statement 'Manoj is a truth-teller' is FALSE → Manoj is a liar.
→ Priya says 'Amit is a liar' - this is TRUE (since Amit is liar).
→ If Priya tells truth, then Priya is truth-teller.
→ Manoj (liar) says 'Priya is a liar' - FALSE (since Priya is truth) → consistent.
This gives: Manoj=L, Priya=T, Amit=L (two liars, one truth-teller).

Step 2: Assume Amit is a truth-teller.
→ Amit's statement 'Manoj is a truth-teller' is TRUE → Manoj is truth-teller.
→ Manoj (truth) says 'Priya is a liar' → TRUE → Priya is liar.
→ Priya (liar) says 'Amit is a liar' - FALSE (since Amit is truth) → consistent.
This gives: Manoj=T, Priya=L, Amit=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Amit also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Manoj and Amit are truth-tellers, Priya is a liar.

Question 15

Divya says: 'Vikram is a liar' Vikram says: 'Rahul is a liar' Rahul says: 'Divya is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Rahul is a liar.
→ Rahul's statement 'Divya is a truth-teller' is FALSE → Divya is a liar.
→ Vikram says 'Rahul is a liar' - this is TRUE (since Rahul is liar).
→ If Vikram tells truth, then Vikram is truth-teller.
→ Divya (liar) says 'Vikram is a liar' - FALSE (since Vikram is truth) → consistent.
This gives: Divya=L, Vikram=T, Rahul=L (two liars, one truth-teller).

Step 2: Assume Rahul is a truth-teller.
→ Rahul's statement 'Divya is a truth-teller' is TRUE → Divya is truth-teller.
→ Divya (truth) says 'Vikram is a liar' → TRUE → Vikram is liar.
→ Vikram (liar) says 'Rahul is a liar' - FALSE (since Rahul is truth) → consistent.
This gives: Divya=T, Vikram=L, Rahul=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Rahul also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Divya and Rahul are truth-tellers, Vikram is a liar.

Question 16

Divya says: 'Neha is a liar' Neha says: 'Anita is a liar' Anita says: 'Divya is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Anita is a liar.
→ Anita's statement 'Divya is a truth-teller' is FALSE → Divya is a liar.
→ Neha says 'Anita is a liar' - this is TRUE (since Anita is liar).
→ If Neha tells truth, then Neha is truth-teller.
→ Divya (liar) says 'Neha is a liar' - FALSE (since Neha is truth) → consistent.
This gives: Divya=L, Neha=T, Anita=L (two liars, one truth-teller).

Step 2: Assume Anita is a truth-teller.
→ Anita's statement 'Divya is a truth-teller' is TRUE → Divya is truth-teller.
→ Divya (truth) says 'Neha is a liar' → TRUE → Neha is liar.
→ Neha (liar) says 'Anita is a liar' - FALSE (since Anita is truth) → consistent.
This gives: Divya=T, Neha=L, Anita=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Anita also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Divya and Anita are truth-tellers, Neha is a liar.

Question 17

Divya says: 'Manoj is a liar' Manoj says: 'Sanjay is a liar' Sanjay says: 'Divya is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Sanjay is a liar.
→ Sanjay's statement 'Divya is a truth-teller' is FALSE → Divya is a liar.
→ Manoj says 'Sanjay is a liar' - this is TRUE (since Sanjay is liar).
→ If Manoj tells truth, then Manoj is truth-teller.
→ Divya (liar) says 'Manoj is a liar' - FALSE (since Manoj is truth) → consistent.
This gives: Divya=L, Manoj=T, Sanjay=L (two liars, one truth-teller).

Step 2: Assume Sanjay is a truth-teller.
→ Sanjay's statement 'Divya is a truth-teller' is TRUE → Divya is truth-teller.
→ Divya (truth) says 'Manoj is a liar' → TRUE → Manoj is liar.
→ Manoj (liar) says 'Sanjay is a liar' - FALSE (since Sanjay is truth) → consistent.
This gives: Divya=T, Manoj=L, Sanjay=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Sanjay also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Divya and Sanjay are truth-tellers, Manoj is a liar.

Question 18

Divya says: 'Pooja is a liar' Pooja says: 'Kiran is a liar' Kiran says: 'Divya is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Kiran is a liar.
→ Kiran's statement 'Divya is a truth-teller' is FALSE → Divya is a liar.
→ Pooja says 'Kiran is a liar' - this is TRUE (since Kiran is liar).
→ If Pooja tells truth, then Pooja is truth-teller.
→ Divya (liar) says 'Pooja is a liar' - FALSE (since Pooja is truth) → consistent.
This gives: Divya=L, Pooja=T, Kiran=L (two liars, one truth-teller).

Step 2: Assume Kiran is a truth-teller.
→ Kiran's statement 'Divya is a truth-teller' is TRUE → Divya is truth-teller.
→ Divya (truth) says 'Pooja is a liar' → TRUE → Pooja is liar.
→ Pooja (liar) says 'Kiran is a liar' - FALSE (since Kiran is truth) → consistent.
This gives: Divya=T, Pooja=L, Kiran=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Kiran also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Divya and Kiran are truth-tellers, Pooja is a liar.

Question 19

Amit says: 'Leena is a liar' Leena says: 'Rahul is a liar' Rahul says: 'Amit is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Rahul is a liar.
→ Rahul's statement 'Amit is a truth-teller' is FALSE → Amit is a liar.
→ Leena says 'Rahul is a liar' - this is TRUE (since Rahul is liar).
→ If Leena tells truth, then Leena is truth-teller.
→ Amit (liar) says 'Leena is a liar' - FALSE (since Leena is truth) → consistent.
This gives: Amit=L, Leena=T, Rahul=L (two liars, one truth-teller).

Step 2: Assume Rahul is a truth-teller.
→ Rahul's statement 'Amit is a truth-teller' is TRUE → Amit is truth-teller.
→ Amit (truth) says 'Leena is a liar' → TRUE → Leena is liar.
→ Leena (liar) says 'Rahul is a liar' - FALSE (since Rahul is truth) → consistent.
This gives: Amit=T, Leena=L, Rahul=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Rahul also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Amit and Rahul are truth-tellers, Leena is a liar.

Question 20

Divya says: 'Amit is a liar' Amit says: 'Deepa is a liar' Deepa says: 'Divya is a truth-teller' Exactly one person is a liar. What can be concluded?
Let's solve step by step:

Step 1: Assume Deepa is a liar.
→ Deepa's statement 'Divya is a truth-teller' is FALSE → Divya is a liar.
→ Amit says 'Deepa is a liar' - this is TRUE (since Deepa is liar).
→ If Amit tells truth, then Amit is truth-teller.
→ Divya (liar) says 'Amit is a liar' - FALSE (since Amit is truth) → consistent.
This gives: Divya=L, Amit=T, Deepa=L (two liars, one truth-teller).

Step 2: Assume Deepa is a truth-teller.
→ Deepa's statement 'Divya is a truth-teller' is TRUE → Divya is truth-teller.
→ Divya (truth) says 'Amit is a liar' → TRUE → Amit is liar.
→ Amit (liar) says 'Deepa is a liar' - FALSE (since Deepa is truth) → consistent.
This gives: Divya=T, Amit=L, Deepa=T (two truth-tellers, one liar).

Both assignments are valid! This puzzle has two solutions.

To guarantee a unique solution, we add a fourth person:
Deepa also says: 'Exactly one of us is a liar'

With this constraint, only Step 2 works (two truth-tellers, one liar).
Therefore, Divya and Deepa are truth-tellers, Amit is a liar.
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