1 because 7 and 31 are prime factors
The GCF is 31.
The GCF is 1.
The GCF is 31.
7 (7 x 19, 7 x 31)
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF of 31 and 6 is 1.
The GCF is 31.
You need at least two numbers to find a GCF. If that's 3 and 7, the GCF is 1.
1 is the GCF of 33 and 31 because 31 is a prime number.