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15 & 20 have an infinite number of Common Multiples; the first three are 60, 120 and 180.

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Q: What are three common multiples of 15 and 20?
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What are three pair of multiples that have 5 as their greatest common factor?

10 and 15 15 and 20 20 and 25


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What are the common multiples of 9 15 and 20?

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