The GCF is 7.
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The greatest common factor of 42, 77 and 84 is 7.
The answer is 11
7 is the highest common factor of 21, 77 and 91.
Oh, dude, the highest common factor of 77 and 161 is 7. Like, you take the factors of each number, which are 1, 7, 11, 77 for 77, and 1, 7, 23, 161 for 161, and then you pick the highest one they have in common. It's like finding the coolest friend they both hang out with.
The Highest Common Factor is 11