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6 times 9 is 54 (fifty-four) and 9 times 9 is 81 (eighty-one).

2 times 27 is 54 and 3 times 27 is 81.

Therefore, 9 and 27 are both common factors of 54 and 81. However, 6 and 9 have themselves a common factor (3), whereas 2 and 3 do not. Therefore, 27 is the greatest common factor of 54 and 81.

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