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Anonymous
The greatest common factor of 39, 42, and 72 is 3
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The answer is 3.
The GCF is 6.
The GCF is 1.
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
3 are.