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The GCF is 7.
The GCF is 21.
168 - 1, 2, 4, 6, 8, 12, 14, 21, 28, 42, 848 - 1, 2, 4, 8the GCF is 8
7 is the gcf of 28 35 and 42
The GCF is 2.
The GCF is 3.