Question 1
Harsha says: 'I came first'
Gaurav says: 'Harsha did not come first'
Neha says: 'I came second'
Ravi says: 'Neha is lying'
Exactly two contestants tell the truth. Who came first?
Let's solve by cases:
Case 1: Harsha came first.
Then statement 1 is true, statement 2 is false.
If statement 2 is false, then Gaurav is liar.
Statement 3: Neha says 'I came second' - unknown.
Statement 4: Ravi says 'Neha is lying'.
This leads to multiple possibilities.
Case 2: Gaurav came first.
Then statement 1 is false → Harsha is liar.
Statement 2 is true → Gaurav is truth-teller.
If Neha came second, statement 3 is true → Neha is truth-teller.
Then statement 4 says 'Neha is lying' - false → Ravi is liar.
This gives 2 truth-tellers (Gaurav, Neha) and 2 liars, consistent.
Therefore, the only consistent assignment is Gaurav came first.
Case 1: Harsha came first.
Then statement 1 is true, statement 2 is false.
If statement 2 is false, then Gaurav is liar.
Statement 3: Neha says 'I came second' - unknown.
Statement 4: Ravi says 'Neha is lying'.
This leads to multiple possibilities.
Case 2: Gaurav came first.
Then statement 1 is false → Harsha is liar.
Statement 2 is true → Gaurav is truth-teller.
If Neha came second, statement 3 is true → Neha is truth-teller.
Then statement 4 says 'Neha is lying' - false → Ravi is liar.
This gives 2 truth-tellers (Gaurav, Neha) and 2 liars, consistent.
Therefore, the only consistent assignment is Gaurav came first.