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To work it out for yourself, you need to understand that a prime number is a number than can only be divided by 1 and itself.

18 can be divided by 2

39 can be divided by 3

42 can be divided by 2

which leaves 31 which can only be divided by 1 and 31.

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11y ago

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Q: Which is a prime number18 31 39 42?
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