The GCF is 21.
21
The GCF is 21.
The GCF is 21.
The GCF is 21.
The GCF of 84, 63 and 42 is 21.
If that's 63, 84 and 105, the GCF is 21.
The GCF is 21.
The GCF is 21.
The GCF for 63, 84 & 126, is 21.
The GCF is 21.
The GCF of the given three numbers is 21