The GCF is 3.
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Common factors of 6 and 9 are: 1 and 3.
6 is the highest common factor 6*7 = 42 6*9 = 54
3
36 is the first number with 3 6 and 9 as common factors. thereafter you add 18 which is the smallest common factor for 3 6 and 9 therefore 36 54 72
The least common factor of any set of numbers is 1.