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The GCF for 20 30 18 is 2
The GCF is 6.
The GCF is 2.
The GCF is 3.
gcf(20, 30, 90) = 10
6 is the GCF of 30 and 18.
The GCF is 5.
The GCF of 30, 50, 20 is 10.
The GCF of 20, 30 and 63 is 1.