The GCF is 6.
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The greatest common factor of 18, 30, and 42 is 2.
The greatest common factor of the numbers 12 and 42 is 6.
The greatest common factor of 42 depends upon the other numbers with which 42 has COMMON factors. However, the greatest common factor HAS to be one of the factors of 42 which are: 1, 2, 3, 6, 7, 14, 21, 42.
7
The GCF is 6.