Answer :

jgfm
It's very simple, take a look.

8, 9, 12 | 2
4, 9,  6  | 2
2, 9, 3  |  2
1, 9, 3  | 3
1, 3, 1  | 3
1,  1, 1

2² * 3² *2 = 72


LCM(8,9,12) = 72
The LCM of 8, 9, and 12 is 72. That is the Lowest Common Multiple. 

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