It is: 2
3 is the greatest common factor of 42 and 99.
It is 7
The GCF of 20, 42, and 78 is 2.
2.
42 is the greatest factor of 42.
2
It is: 2
The least common factor of any set of positive integers is 1.
The GCF is 2.
The GCF is 2.
The GCF is 2.
The greatest common factor of the numbers '420' and '2646' is '42'.