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The GCF is 3.
GCF of 30 and 63 is 3.
The GCF of 20, 30 and 63 is 1.
The GCF is 21.
The GCF is 63.
The GCF is 9.
The GCF is: 63
The GCF is 7.
The GCF is 1.