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SSC CGL 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.

  1. (A)19
  2. (B)51
  3. (C)17
  4. (D)11

Correct answer: (B) 51

Each of 11, 17, 19 is a prime number, whereas 51 is not a prime number. Therefore 51 does not belong to the group and is the odd one out.

About this question

Subject
General Intelligence and Reasoning
Topic
Classification
Exam
SSC CGL
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Last reviewed on 5 Oct 2026. Spotted a mistake? See our correction policy.