0
Anonymous
21= 1,3,7
56= 1,2,2,2,7
24= 1,2,2,2,3
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The greatest common factor of 20, 24, and 56 are 4 .
8 is the greatest common factor for 8, 24 and 56
The GCF of 21, 56, 63, and 84 is 7.
It is: 2
The GCF is 7.