3 and 18
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There is an infinite list of sets of numbers with a GCF of 6. 6 and 12, for instance.
The greatest common factor, or GCF, is the largest positive integer that will divide evenly with no remainder into all the members of a given set of numbers. The GCF of 6 and 9 is 3.
The product of the GCF and LCM of a pair of numbers is equal to the product of the numbers.
Any pair of prime numbers as for example 19 and 23
The GCF is 31.