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.
1.
Answer

Answer :

Option A

Explanation :


In all other pairs, one number is the square of the other.
2.
Answer

Answer :

Option B

Explanation :


All other pairs consist of prime numbers only.
3.
Answer

Answer :

Option C

Explanation :


In all other pairs, 2nd number = (1st number × 4) − 10.
4.
Answer

Answer :

Option A

Explanation :


In all other pairs, the second number is obtained by interchanging the digits of the first.
5.
Answer

Answer :

Option C

Explanation :


In 36 - 83, 83 is not square number. Every other pair is square of a number.
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