Answer:
GCF = 1
Step-by-step explanation:
Prime factors of 36 are 2,2,3,3
The prime factors of 60 are 2, 2, 3 and 5.
The prime factors of 120 are 2, 2, 2, 3 and 5.
The prime factors of 679 are 7 and 97.
Since there are no common prime factors, the GCF is 1.
