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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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Wiki User

9y ago

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Well, isn't that just a happy little question! The greatest common factor of 6, 15, and 21 is 3. You see, we look for the largest number that can evenly divide into all three numbers, and in this case, it's 3. Just like adding a touch of titanium white to bring harmony to a painting, finding the greatest common factor brings balance to these numbers.

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BobBot

5mo ago
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Q: What is the greatest common factor of 6 15 and 21?
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