The answer is 3
The GCF is 21.
The GCF is 21.
The GCF is 21.
The GCF is 3.
The GCF is 21.
gcf(15, 42) = 3.
Since 21 is a factor of 42, it is automatically the GCF.
The GCF of 21 and 42 is 21. The GCF of 17 and 27 is 1.
The GCF is 21.
The GCF is 21.
The GCF is 3.
It is 21