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gcf of 91 and 21 = 7
The GCF is 7.
The GCF is 9.
The GCF is 3.
The GCF is 7.The GCF is 7.
The GCF of 1 and 91 is 1. The GCF of 91 and 91 is 91.
The GCF is 1.