UPSC Prelims 2024·CSAT·Logical Reasoning·Coding Decoding

Choose the group which is different from the others:

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Last updated 23 May 2026, 3:31 pm IST
  1. A17, 37, 47, 97
  2. B31, 41, 53, 67
  3. C71, 73, 79, 83
  4. D83, 89, 91, 97Correct

Explanation

To determine the correct group, we must examine the properties of the numbers in each option. Option A contains 17, 37, 47, and 97. All of these are prime numbers. Option B contains 31, 41, 53, and 67. All of these are prime numbers. Option C contains 71, 73, 79, and 83. All of these are prime numbers. Option D contains 83, 89, 91, and 97. In this group, 91 is not a prime number because it is divisible by 7 and 13 (7 times 13 equals 91). Since groups A, B, and C consist entirely of prime numbers, while group D contains a composite number, group D is the one that is different from the others.
Logical Reasoning: Choose the group which is different from the others

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