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The GCF is 3.
GCF(9, 15) = 3. The signs are irrelevant.
The GCF is 1.
The GCF of 9, 12, 15 is 3.
It is 3
gcf(15, 9, 19) = 1.
The GCF of 4, 9, and 15 is 1.
3