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7
The GCF is 7.
The HCF of 112 and 63 is 7
If you mean 28, 49 and 84 then the hcf is 7
HCF(40, 63) = 1
The GCF is 9.
The GCF is 21.
If you mean: 21, 49 and 84 then the HCF is 7