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It is: 7
The GCF is 7.
7
The HCF is 7.
49 = 7 x 7, 21 = 7 x 3, 91 = 7 x 13. HCF is 7
If you mean: 21, 49 and 84 then the HCF is 7
The HCF of 56 and 21 is 7