Six computers labelled A, B, C, D, E and F are placed in a row facing towards north. Two computers are placed between A and B. C is placed second to the right of B. D is placed second to the right of C. E is placed to the immediate left of B. Which computer is placed to the right of A?

D

Two computers are placed between A and B. C is placed second to the right of B.

CASE 1:

A   _    _   B   _   C

CASE 2:

B   _   C   A

D is placed second to the right of C.

CASE 1:

It is not possible because C is already at the extreme right end. So, the only possibility is CASE 2.

CASE 2:

B   _   C   A   D

E is placed to the immediate left of B.

E    B   _   C   A   D

So, the only place for F is to the immediate right of B.

E    B   F   C   A   D

So, only D computer is to the right of A.