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The GCF is: 1
The GCF is 1.
The GCF is 7.
The GCF of 12 and 42 is 6
7
The GCF is 7.7 is the GCF of 42, 49 and 84.
The GCF is 6.
The GCF of 1218 and 42 is 42. The GCF of 12, 18 and 42 is 6.