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The greatest common factor of 21 and 63 is 21.Since 21 is a factor of 63, it is automatically the GCF.

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7y ago
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7y ago

The GCF is 21.

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7y ago

GCF(21, 63) = 21.

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7y ago

GCF(63, 21) = 21.

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Wiki User

13y ago

It's 21.

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Q: What is the greatest common factor of 21 and 63?
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