Question: what is greatest common factor of 3?
Answer: Note that the GCF (x,y,z) = GCF ( GCF (x,y),z). In other words, the GCF of 3 or more numbers can be found by finding the GCF of 2 numbers and using the result along with the next number to find the GCF and so on. So, the greatest common factor of 120 and 50 is 10.