The factors of 12 are: 1, 2, 3, 4, 6, 12.
The factors of 20 are: 1, 2, 4, 5, 10, 20.
The common factors are: 1, 2, 4
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The greatest common factor of 3, 5, and 12 is 1.
The GCF is 15.
The GCF is 1.
It is 12*(5 - 3).
There can be only one GCF. 5 and 12 are coprime so GCF(5, 12) = 1