Reasoning - Classification

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

Answer :

Option C

Explanation :


In all other groups, the first number is obtained by adding 2 to the product of the second and the third numbers.
12.
Answer

Answer :

Option A

Explanation :


All other pairs contain cubes of two successive natural numbers. e.g. 8 = 23 and 27 = 33.
13.
Answer

Answer :

Option D

Explanation :


This is the only group in which the two numbers have no common factor.
14.
Answer

Answer :

Option D

Explanation :


In all other pairs, the sum of two numbers is 8.
15.
Answer

Answer :

Option B

Explanation :


In all other pairs, the ratio of the two numbers is 7 : 8.
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