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The GCF of 21 and 51 is 3. Both these numbers have only one prime factorization.

21=3*7

51=3*17

So the greatest common divisor is 3.

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6y ago
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13y ago

GCF of 21 and 51 is 3.

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6y ago

GCF(51, 21) = 3.

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Q: What is the greatest common factor of 21 and 51?
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