The Greatest Common Factor is 13
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The GCF of 1 and 91 is 1. The GCF of 91 and 91 is 91.
The GCF of 28, 84, and 91 is 7.
The GCF of 35, 49, and 91 is 7.
Since 13 is a factor of 91, it is automatically the GCF.
The GCF is 1.