SSC GD Classification question with solution
ClassificationEasy
Three of the following four numbers are alike in a certain way and one is different. Select the odd one out.
- (A)31
- (B)43
- (C)21
- (D)11
Correct answer: (C) 21
Each of 31, 43, 11 is a prime number, whereas 21 is not a prime number. Therefore 21 does not belong to the group and is the odd one out.
About this question
- Subject
- General Intelligence and Reasoning
- Topic
- Classification
- Exam
- SSC GD
- Attempts on SSC Rank
- Not attempted yet
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Last reviewed on 5 Oct 2026. Spotted a mistake? See our correction policy.