The GCF of 12 and 17 is 1. 17 is a Prime number and is therefore only divisible by 1, so this is the only option between 12 and 17.
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The GCF is 1.
Greatest common factor for 14 and 17 is 1.
The greatest common factor of 17 and 26 is 1.
The greatest common factor of 17 and 45 is 1 . The numbers are coprime.
The greatest common factor of 34, 51, and 102 is 17.