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Anonymous
The factors of 77 are: 1, 7, 11 and 77
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The greatest common factor of 21 and 77 is 7.
Greatest common factor of 33 and 77 is 11.
The GCF of 13 and 77 is 1.
The greatest common factor of 22 , 66 , 77 = 11
the answer is 7