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The GCF is 6.
The greatest common factor of 6, 12, and 42 is 6.6 x 1 = 66 x 2 = 126 x 7 = 42
The GCF is 66.
The GCF is 2.
The GCF is 7.
The GCF is 42.
The GCF is 3.
The GCf is 6.