5
5
Five.
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The greatest common factor of 20, 21, and 25 is 1. Although 20 and 25 can be divisible by 5, 21 can not. Therefore, the only common factor between these three numbers is 1 and it's the greatest one as well.
The Greatest Common Factor of 40 and 250 is 10.
The GCF is 5.
1 and 5, the GCF.
The greatest common factor of 25 and 76 is 1.