This cannot be answered because an LCM (least common multiple) is the smallest positive number that is a multiple of two or more numbers.
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If you mean: 8, 20 and 12 then the LCM is 120
The LCM of these numbers is 120. LCM is Least Common Multiple.
The Least Common Multiple (LCM) for 20 12 11 is 660.
The LCM of 12, 20, and 30 is 60
It is: 60