The GCF of 20, 42, and 78 is 2.
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42 is the greatest factor of 42.
The greatest common factor of 42 and 66 is 6.6
The greatest common factor of the numbers '420' and '2646' is '42'.
The greatest common factor of 16 and 42 is 2.
Since 3 is a factor of 42, it is automatically the GCF.