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ASVAB · Number Properties

Which of the following is a prime number?

Correct answer

37

  1. A 21
  2. B 27
  3. C 37
  4. D 51

Why this is the answer

37 is prime — only divisible by 1 and 37. 21 = 3×7; 27 = 3×9; 51 = 3×17.
Source: ASVAB MK, Prime Numbers

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