Question
Find the odd number out in the following set and state
the reason: 131, 151, 171, 191, 211Solution
Check primality: 131 is prime 151 is prime 171 = 3 × 57 = 3 × 3 × 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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