Which of these are prime numbers: 32, 17, 11, 9, 48?

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A 17 and 11
B 32 and 48
C 9 and 11
D None of the above

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Answer: A. 17 and 11

17 and 11 are prime numbers (their only factors are 1 and themselves). 9 = 3 × 3 is composite, and 32 and 48 are even numbers greater than 2, so they are composite.

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Which of these are prime numbers: 32, 17, 11, 9, 48?

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