Choose the group which is different from the others:

Choose the group which is different from the others:
  1. 17, 37, 47, 97
  2. 31, 41, 53, 67
  3. 71, 73, 79, 83
  4. 83, 89, 91, 97

Solution

In groups A, B and C all four numbers are prime. In group D, 91 = 7 times 13 is not prime (83, 89, 97 are prime). Hence group D is different from the others.

Asked in: CSAT 2023

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