The GCF is 1.
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The greatest common factor of 13 and 79 is 1.
The GCF is 1.
The GCF is 1.
The GCF is 7.
The GCF 21 and 58 is 1.21 = 3x758 = 2*29There no common factors, so the GCF is 1. We can say that these two numbers are "relatively prime".