The GCF of that set is 1.
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The GCF is 11.
GCF(62, 121) = 1. The two numbers are coprime.
The greatest common factor of the numbers 11 and 19 is 1.
The greatest common factor of the numbers 7, 77 and 770 is 7.
There are many possibilities but in general because 11 is a prime number it and any other prime numbers can't have 11 as their GCF.