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The greatest common factor of 21 and 39 is 3

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8y ago
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Wiki User

11y ago

Factors of 19: 1, 19.

Factors of 21: 1, 3, 7, 21.

GCF (19, 21) = 1

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8y ago

The GCF of 21 and 43 is 1.

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11y ago

GCF(21, 43) = 1

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Hannah Stringer

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2y ago

I need help figuring this out

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Q: What is the greatest common factor of 21 and 43?
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