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Question

31 is a ______ number.

A
prime
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B
composite
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C
even
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D
even prime
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Solution

The correct option is A prime
Factors of 31: 1, and 31

Since it has only two factors, 1 and the number itself, it is a prime number.
It is not divisible by 2, therefore it is not an even number.
2 is the only even prime number.

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