The GCF is 1.
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The greatest common factor of 15 and 21 is 3The factors of 15 are: 1, 3, 5, 15The factors of 21 are: 1, 3, 7, 21The common factors are: 1, 3The Greatest Common Factor (GCF) is: 3
The GCF is 3.
The greatest common factor of 21 and 77 is 7.
The Greatest Common Factor of 21, 9 is 3.
The GCF is 3.