DATE:20-11-2017
Q)
A,E,F,G ran a race. 
A said, "I did not finish 1st or 4th"E said "I did not finish 4th"F said "I finished 1st"G said "I finished 4th"There were no ties (draw) in the competition. Three of them told the truth. Who finished 4th?

Ans:  G (Option-4)

SOLUTION:
1)let us assume one by one
2)let A is lying.. but if so he is either 1st or 4th.but then 3)either F is also lying ang G is also lying. that can't be true as 3 of them r saying trut. so A is saying truth.
4)Now if E is lying he is 4th. but G is saying he is 4th since both can't lie at same time E is also saying truth
5)Now If G is lying then person that comes 4th is F as A and E r saying truth but F is saying he is first so both can't lie so G is also saying truth. F is lying.