The gcf is 1. 17 is prime, so its only factors are 1 and 17. 21 has more factors, 1, 3, 7, and 21. The greatest common factor is 1.
The GCF is 1.
The GCF of 21 and 42 is 21. The GCF of 17 and 27 is 1.
The GCF of 17 and 21 is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
GCF of 102 and 17 is 17.
The GCF of 21 and 51 is 3. Both these numbers have only one prime factorization. 21=3*7 51=3*17 So the greatest common divisor is 3.
The GCF is 17.
21 - 1, 3, 7, 21 51 - 1, 3, 17 ,51 the GCF is 3
The GCF is 17.
The GCF is 21.