Only 1 is a factor of both 9 and 4
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GCF(4, 7, 9) = 1.
The GCF is 1.
The GCF is 1.
The GCF is 9. From C2H5.OH: This is wrong. The GCF is 4 (6 x 4, 10 x 4, 9 x 4)
gcf(9, 8) =1 gcf(9, 12) = 3 gcf(8, 12) = 4 gcf(9, 8, 12) = 1