The GCF is 1.
gcf of 11 and 21 is 1.
The GCF/HCF of 11 and 21 is 1.
The GCF of that set is 1.
7 (7 x 19, 7 x 31)
The GCF is 1.
The GCF is 21.
The GCF is 1.The GCF of 14, 21 and 24 is 1.
The GCF is 21.
The GCF is 11.
The GCF is 21.
The GCF is 1.
The GCF is 3.