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Find the odd man out. 3, 5, 11, 14, 17, 21

  • A.21
  • B.17
  • C.14
  • D.3

Answer: C

Every number in the list is odd except one.

\[ 3,\; 5,\; 11,\; 17,\; 21 \;\text{are odd}; \qquad 14 \;\text{is even} \]

So 14 is the odd man out. The list is deliberately salted with 21, which is not prime, to tempt the "all primes" reading - but 21 is still odd.

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