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The factors of 15 are 1, 3, 5, and 15.

The factors of 18 are 1, 2, 3, 6, 9, and 18.

The factors of 12 are 1, 2, 3, 4, 6, and 12.

The common factors of 15, 18, and 12 are 1 and 3 .

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12y ago

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