Factors of 77: 1, 7, 11, 77
Factors of 20: 1, 2, 4, 5, 10, 20
GCF (77, 20) = 1
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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.
the answer is 7
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