gcf(15, 9, 19) = 1.
The GCF is 1.
The GCF of 9, 12, 15 is 3.
The GCF is 3.
The GCF is 3.
There are no common factors between 15 and 19 aside from 1. This means that the GCF is 1.
The GCF is 3.
The gcf of 6, 15, and 21 is 3. But once you throw that 19 in there, it's ' 1 '.
The GCF is 3.
The GCF is 1.
The GCF of 4, 9, and 15 is 1.
The GCF is 3.
The GCF is 1.