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21 is divisible by 3 and 7, so it is composite. 91 is divisible by 7 and 13, so it is composite. 51 is divisible by 3 and 17. 31 is divisible by only 1 and itself, so it is the Prime number.

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โˆ™ 2014-02-14 20:55:46
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Q: Which number is prime out of 91 51 31 21?
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