The greatest common factor of 49 and 77 is 7, no matter what method you use
to find it.
If you solve the same problem twice, using two different methods, and get two
different answers, then at least one of the answers is wrong, and there's a good
chance that they both are.
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The GCF is 11.
The GCF is 7.
Since 37 is a prime number, the GCF is 1
The greatest common factor of the numbers 7, 77 and 770 is 7.
Greatest common factor of 33 and 77 is 11.