The GCF is 77.
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The GCF is 11.
First find the prime factors of each: 847= 7 x 11 x 11 91= 7 x 13
No, it's factors are: 5929 x 1 847 x 7 539 x 11 121 x 49 77
7, 11, 13, 49, 77, 121, 143, 169, 539, 637, 847, 1,001, 1,183, 1,573, 1,859, 5,929, 7,007, 8,281, 11,011, 13,013, 20,449, 77,077, 91,091, 143,143, 1,002,001
121