The GCF is 1.
The GCF is 1.
The GCF is 3.
The factors of 21 are: 1, 3, 7, 21 The factors of 51 are: 1, 3, 17, 51
21 - 1, 3, 7, 21 51 - 1, 3, 17 ,51 the GCF is 3
For 21: 3,7 For 51: 3,17
51/21 = 17/7 = 23/7
Their GCF is 7 . I don't know what a GFC is.
It is one.
The GCF is 7.
The GCF is 1.
The GCF is 1.
It is: 21