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The greatest common factor of 6, 15 and 21 is 3.

The prime factorization of 6 is 2*3

The prime factorization of 15 is 3*5

The prime factorization of 21 is 3*7

The GCF is then 3, as it is the only common factor.

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โˆ™ 2016-04-06 21:14:57
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Q: What is the greatest common factor of 6 15 and 21?
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