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The highest common factor is 7
Well, darling, the greatest common factor for 21, 35, and 56 is 7. It's like finding the perfect little black dress that fits all three numbers like a charm. So, go ahead and flaunt that GCF like it's the latest fashion trend.
1 is the only common denominator.
The least common denominator of 3 and 13 is 39.
The greatest common denominator of any set of denominators is infinite.