Factors of 9: 1, 3, 9
Factors of 18: 1, 2, 3, 6, 9, 18
Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42
GCF (9, 18, 42) = 3
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The greatest common factor of 18 21 and 42 is 3.
6
If you mean 18, 42 and 36 then the GCF is 6
It is: 6
The greatest common factor of 39, 42, and 72 is 3