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A Prime number has exactly two factors, 1 and the number itself. The factors of 21 are 1, 3, 7, and 21, and the factors of 27 are 1, 3, 9, and 27. Since 21 and 27 have more than 2 factors, they are composite numbers.

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โˆ™ 2012-03-01 02:06:44
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Q: Is 21 and 27 prime and composite numbers?
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