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The GCF is 7.
It is: 7
The HCF of 21, 84 and 91 is.... 1 ! The number 91 is a prime number.
7
It is: 1
If you mean 28, 49 and 84 then the hcf is 7
If you mean: 21, 49 and 84 then the HCF is 7
It is 7