Reasoning - Classification

Directions to solve :
In each of the following questions, four numbers are given, out of which three are alike in some manner and one is different. Choose the one which is different from the rest three.
11.
Answer

Answer :

Option D

Explanation :


In all other numbers, the product of digits is 12.
12.
Answer

Answer :

Option B

Explanation :


Each number except 552, is an odd number.
13.
Answer

Answer :

Option A

Explanation :


In all other numbers, the sum of the digits is 27.
14.
Answer

Answer :

Option B

Explanation :


11 is the only prime number in the group.
15.
Answer

Answer :

Option A

Explanation :


Each of the number except 51, is a perfect square.
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