The GCF is 1.
The GCF is 1.
17 is prime so its factors are 1 and 17. 17 is neither a factor of 15 nor 30, so the GCF is 1.
It's difficult to determine if you want that to be one set or five. Taken as a whole, the GCF is 1. Individually... The GCF of 25 and 75 is 25. The GCF of 18 and 30 is 2. The GCF of 4 and 10 is 2. The GCF of 12 and 17 is 1. The GCF of 30 and 96 is 6.
The GCF is 1.
GCF of 102 and 17 is 17.
The GCF is 17.
The GCF is 17.
The GCF is 17.
The GCF is 30.
The GCF of 11 and 17 is 1!
The GCF is 17.