The GCF is 3.
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The GCF of 9, 18, and 42 is 3.The factors of 9 = 3*3The factors of 18 = 2*3*3The factors of 42 = 2*3*7So the greatest common factor = 3.
The GCF is 7.
The GCF is 2.
The GCF is 7.7 is the GCF of 42, 49 and 84.