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Since 15 is a factor of 45, its factors are the common factors of 15 and 45.

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

The factors of 45 are 1, 3, 5, 9, 15, and 45.

The factors they have in common are 1, 3, 5, and 15.

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16y ago

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