The GCF is 1.
The GCF is 39.
39 and 35 are mutually prime; in other words they have no common factor except unity which is not a proper factor.The GCF is 1.
The GCF is 35.
The GCF is 39.
The GCF is 35.
The GCF is 1.
The GCF is 3.
The GCF is: 13
The GCF is 1.
The GCF is 3.
The GCF is 1.