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Perform term/canonical factorization to get:

54 = 6 * 9

= 2 * 3 * 3²

= 2 * 3³

81 = 9²

= 34

117 = 3 * 39

= 3 * 3 * 13

= 3² * 13

So the only greatest term in common of these numbers is 3².

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Q: What is the gcf of 54 81 and 117?
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