The GCF (not GFC) refers to something in common between at least two things. You have one term here.
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The GFC of 100, 20, and 2 is 2.
No idea what the gfc is but GCF(35, 45) = 5.
Not sure about GFC but GCF(7, 4) = 1.
its GCF not GFC Greatest Common Factor: the answers 12
Their GCF is 7 . I don't know what a GFC is.