The factors of 18 are:
1, 2, 3, 6, 9, 18
The factors of 42 are:
1, 2, 3, 6, 7, 14, 21, 42
The Greatest Common Factor:
GCF = 6
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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