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Analytical Puzzles Medium 2 min

Four books A, B, C and D are arranged on a shelf. A is somewhere before C. B is immediately after A. D is at the right end. What is the arrangement?

Hint
A and B form a block.

Answer

A-B-C-D.

Explanation

D must be at the right end. A must precede C and B immediately follows A. Therefore A-B-C occupy the first three positions.

Step-by-Step Solution

A-B is a fixed block.
D = position 4.
C must follow A.
Therefore A-B-C-D.
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