7 is the Greatest Common Factor (GCF)
Factored into their prime factors:
28 = 2 x 2 x 7
77 = 7 x 11
91 = 7 x 13
The only factor they have in common (other than 1) is 7
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The greatest common factor of 21 and 77 is 7.
Greatest common factor of 33 and 77 is 11.
2 is the Greatest common factor.
1.
97