Expert Answers

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first we need to factor 15 and 18:

We know tha:

15 = 3*5

18 = 2*3*3

To calculate the L.C.M, we will multiply all uncommon elements and the heighest power of the common element.

Then the L.C.M  = (3*3) *2 *5 = 90

==> L.C.M (15, 18) = 90

To check:

90 = 15 * 6

90 = 18 * 5

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