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