Five people A, B, C, D, and E are sitting in a row. A is to the left of B but to the right of C. D is sitting at one of the ends. E is sitting between A and D. Who is sitting at the extreme right?
Answer: C. D
Since D is at one end and E is between A and D, D must be at the extreme left or right. Given A is to the left of B, the only arrangement that satisfies all conditions is D at the extreme left and B at the extreme right.