The only proper factors of 77 are 7 and 11. 11 isn't a factor of 259 but 7 is, so the answer is 7.
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The GCF is 7.
The greatest common factor of 77 and 143 is 11.
The greatest common factor of 77 and 88 is 11, and it is also the greatest prime factor.
Well, honey, the highest common factor for 21, 77, and 84 is 7. It's like finding the biggest slice of cake that all three numbers can share without any leftovers. So, grab your calculator and enjoy your math snack!
The GCF is 7.