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.
16.
Answer

Answer :

Option A

Explanation :


Only 119 has different factors, 7 and 17, and no factor is repeated.
17.
Answer

Answer :

Option C

Explanation :


81 is the only square number in the group.
18.
Answer

Answer :

Option A

Explanation :


37 is the only prime number in the group.
19.
Answer

Answer :

Option B

Explanation :


In all other numbers, the sum of the digits is 17.
20.
Answer

Answer :

Option D

Explanation :


83 is the only prime number in the group.
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