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Not sure about GFC but GCF(7, 4) = 1.
Their GCF is 7 . I don't know what a GFC is.
7
4
The greatest common factor for 16 and 20 is 4.
No idea what the gfc is but GCF(35, 45) = 5.
It is 4
The GCF is 7.
The GCF is 1.