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