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.
1.
Answer

Answer :

Option A

Explanation :


In all number except 8314, the sum of first three digits is equal to the unit's digit.
2.
Answer

Answer :

Option A

Explanation :


In each number except 751, the difference of the third and the first digit is the middle one.
3.
Answer

Answer :

Option C

Explanation :


Each of the numbers except 63, is a prime number.
4.
Answer

Answer :

Option D

Explanation :


Each of the numbers except 81, is divisible by 7.
5.
Answer

Answer :

Option B

Explanation :


7 is the only prime number in the group.
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