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The LCM is: 90

It is 90 because 6*15 = 90, 2*45 = 90 and 1*90 = 90

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you told us the hcf

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The LCM of 15, 45 and 90 is 135.

Q: What is the LCM of 15 45 and 90?

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LCM for 45 and 90 is 90.

The LCM of these numbers is 90.