first of all, factor... and it is 6, it is both multiples of 42 and 18
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The Greatest Common Factor of 42 and 18 is 6.
6
3
The common factors of 18, 30, and 42 are: 1, 2, 3, and 6The Greatest Common Factor (GCF) is: 6
The Greatest Common Factor of 28, 42, 63: 7