1, 2, 3, 6, 9, 18
1, 2, 3, 6, 7, 14, 21, 42
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65
1 and 3
The common factors are: 1, 2, 3, 6.
The common (note term) factors of 42 and 36 are 1,2,3, and 6.
The factors of 18 are:1, 2, 3, 6, 9, 18The factors of 42 are:1, 2, 3, 6, 7, 14, 21, 42The Greatest Common Factor:GCF = 6