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The GCF of 21 and 42 is 21.
The GCF of 17 and 27 is 1.
GCF of 21 and 42: 21GCF of 16 and 25: 1
The GCF is 21.
The GCF is 3.
The GCF is 1.
The GCF is: 3
The LCM is: 42
It is 42
21