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The GCF is 1.
GCF of 17 and 81 is 1.
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The GCF is 17.
gcf of 37 and 81 is 1.
The GCF of 27 and 81 is 27. And their LCM is 81.
The GCF is 27.
The GCF is 9.
The GCF is 2.