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      Question

      Find the odd number out in the following set and state

      the reason: 131, 151, 171, 191, 211
      A 131 Correct Answer Incorrect Answer
      B 171 Correct Answer Incorrect Answer
      C 211 Correct Answer Incorrect Answer
      D 151 Correct Answer Incorrect Answer

      Solution

      Check primality: 131 is prime 151 is prime 171 = 3 ├Ч 57 = 3 ├Ч 3 ├Ч 19 (not prime) 191 is prime 211 is prime All except 171 are prime numbers. Answer: 171 is the odd one out (it is not prime).

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