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The GCF is 7.
It is: 7
49 = 7 x 7, 21 = 7 x 3, 91 = 7 x 13. HCF is 7
13
HCF is the highest common factor of two or more numbers. HCF of 28, 35 and 49 is 7.
The GCF is 1.
7