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The answer is 9.
The GCF is 9.
The GCF of 27 and 81 is 27. And their LCM is 81.
The GCF is 45.
The greatest common factor is 9
1, 3, 5, 9, 15, 45 1, 3, 9, 27, 81 1, 3, 9, 11, 33, 99
It is: 9