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Any set of factors that had 18 as a common multiple would also have multiples of 18 in common, so 18 can't be greatest. 9 and 6 have 18 as their least common multiple.

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Q: What common factors have 18 as their greatest common multiple?
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What are the greatest common factor and least common multiple of 18 27 and 78?

The greatest common factor of 18, 27, and 78 is 3. The least common multiple of 18, 27, and 78 is 702. The factors of 18 are: 1, 2, 3, 6, 9, 18 The factors of 27 are: 1, 3, 9, 27 The factors of 78 are: 1, 2, 3, 6, 13, 26, 39, 78 The common factors are: 1, 3 The Greatest Common Factor (GCF) is: 3


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