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The GCF is 14.
14, 28, 42, 56, 70, 84, 98, 112, 126, 140, 154, 168, 182, 196.
14
The hcf is 14
The highest common factor is 14
HCF(98, 182) = 14.
HCF(56, 98, 168) = 14
7 is the highest common factor of 21, 77 and 91.
The GCF is 2.