i believe it's 26 the prime factorization of 156 is 2x2x3x13 and the prime factorization for 910 is 2x5x7x13 and since 2 and 13 are both common you multiply them to get the GCF of 26
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The Greatest Common Factor (GCF) is: 2
Greatest common factor of 78 and 286 is 26.
It is: 13
The GCF is 4.
The GCF is 1.