Since 3 is a factor of 42, it is automatically the GCF.
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3 is the greatest common factor of 42 and 99.
The greatest common factor of 39, 42, and 72 is 3
The greatest common factor of 18 21 and 42 is 3.
The GCF is 3.
The Greatest Common Factor of 44, 42, 3: 1