Question 1
Neha says: 'Gaurav has the ruby'
Gaurav says: 'I do not have the ruby'
Leena says: 'Neha is lying'
Can all these statements be true simultaneously?
Let's test if all statements can be true:
Assumption 1: If Neha tells truth, then Gaurav has ruby.
But Gaurav claims not to have it - contradiction if Gaurav tells truth.
If Gaurav lies, then Gaurav DOES have the item - consistent with Neha.
Then Leena says Neha lies - but we assumed Neha tells truth - contradiction!
Assumption 2: If Neha lies, then Gaurav does NOT have ruby.
Gaurav says the same thing - consistent if Gaurav tells truth.
Leena says Neha lies - consistent if Leena tells truth.
Therefore, all statements CAN be consistent when Neha lies, Gaurav and Leena tell truth.
Thus, the statements are consistent.
Assumption 1: If Neha tells truth, then Gaurav has ruby.
But Gaurav claims not to have it - contradiction if Gaurav tells truth.
If Gaurav lies, then Gaurav DOES have the item - consistent with Neha.
Then Leena says Neha lies - but we assumed Neha tells truth - contradiction!
Assumption 2: If Neha lies, then Gaurav does NOT have ruby.
Gaurav says the same thing - consistent if Gaurav tells truth.
Leena says Neha lies - consistent if Leena tells truth.
Therefore, all statements CAN be consistent when Neha lies, Gaurav and Leena tell truth.
Thus, the statements are consistent.