Mixed Practice III - Magoosh GRE

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What is the LCM of 9 and 15?

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First, find the prime factorization:

9 = 3 x 3

15 = 3 x 5

The LCM must have two factors of 3 and one factor of 5.

3 x 3 x 5 = 45 = LCM

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