Multiple choice general knowledge math & puzzles

Odd Man Out

  1. 21

  2. 121

  3. 71

  4. 81
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

71 is a prime number, whereas 21, 121, and 81 are composite numbers (divisible by 3, 11, and 9 respectively). This makes 71 the odd one out.

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