6 and 12 have a GCF of 6.
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2 numbers have a gcf of 3 = 3 & 6, 6 &9,...
The GCF is 6.
The LCM of these numbers is 18. LCM is Least Common Multiple. The GCF of these numbers is 6. GCF is Greatest Common Factor.
6
The GCF for those three numbers is.... 1 !