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42:1,2,3,6,7,14,21,42
63:1,3,7,9,21,63
98:1,2,7,14,44,98
The GCF is seven.
The GCF is 7.
The GCF is 21.
The GCF of 84, 63 and 42 is 21.
The GCF is 14.
GCF(42, 63, 84) = 21.