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The LCM of 9,12, and 15 is 180.
Let's use prime factorization to see why?
9=32,
12=22 x3
15=3x5.
To find the LCM take 32 , 22 , and 5.
9x4x5=180 which is the answer. Note we took the largest exponent of each of the factors and their product is the LCM.
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