It is 3
The GCF is 3.
36 - 21 = 1536 - 21 = 1536 - 21 = 1536 - 21 = 15
51
The gcf of 6, 15, and 21 is 3. But once you throw that 19 in there, it's ' 1 '.
3
The GCF is 3.
The GCF is 3.
The GCF is 1.
The GCF is 3.
The GCF is 3.
15
The GCF is 3.
The GCF is 3.
The GCF is 1.
The GCF is 3.
36 - 21 = 1536 - 21 = 1536 - 21 = 1536 - 21 = 15
36, 14 and 21 have no common factors other than 1. Therefore, the greatest common factor is 1.