The GCF is 1.
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The GCF (greatest common factor) would be 21.
The greatest common factor of 21 and 77 is 7.
The greatest common factor of 21 and 70 is 71000000The GCF is 7.The GCF is: 1The GCF is 7.
The Greatest Common Factor of 21, 63, 84: 21
The Greatest Common Factor of 21, 9 is 3.