Question 1
Divya: 'At least 2 of us are liars'
Gaurav: 'At most 3 of us are liars'
Amit: 'Exactly 2 of us are liars'
Meera: 'Leena is a truth-teller'
Leena: 'Divya is a liar'
What is the minimum number of liars?
Let L = number of liars.
Statement constraints:
1. Divya: L ≥ 2
2. Gaurav: L ≤ 3
3. Amit: L = 2
4. Meera: Leena is truth-teller
5. Leena: Divya is liar
From statement 3, L must be exactly 2 for that statement to be true.
But statements 1 and 2 are consistent with L=2 as well.
Now check statements 4 and 5:
If L=2, then 3 truth-tellers exist.
Statement 5 says Divya is liar - if true, then Divya is liar.
Statement 4 says Leena is truth-teller - can be true.
This configuration is possible with L=2.
Can L=1? Statement 1 would be false, so Divya would be liar.
Then statement 5 (Leena says 'Divya is liar') would be TRUE.
So Leena would be truth-teller. Then statement 4 (Meera says 'Leena is truth-teller') would be TRUE.
So Meera would be truth-teller. That gives at least 2 truth-tellers (Leena, Meera) plus possibly others, contradicting L=1.
Therefore L cannot be 1.
The minimum L is 2.
Statement constraints:
1. Divya: L ≥ 2
2. Gaurav: L ≤ 3
3. Amit: L = 2
4. Meera: Leena is truth-teller
5. Leena: Divya is liar
From statement 3, L must be exactly 2 for that statement to be true.
But statements 1 and 2 are consistent with L=2 as well.
Now check statements 4 and 5:
If L=2, then 3 truth-tellers exist.
Statement 5 says Divya is liar - if true, then Divya is liar.
Statement 4 says Leena is truth-teller - can be true.
This configuration is possible with L=2.
Can L=1? Statement 1 would be false, so Divya would be liar.
Then statement 5 (Leena says 'Divya is liar') would be TRUE.
So Leena would be truth-teller. Then statement 4 (Meera says 'Leena is truth-teller') would be TRUE.
So Meera would be truth-teller. That gives at least 2 truth-tellers (Leena, Meera) plus possibly others, contradicting L=1.
Therefore L cannot be 1.
The minimum L is 2.