Least Common Multiple (LCM) for 20 30 40 is 120
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The Least Common Multiple (LCM) for 18 20 30 is 180.
The Least Common Multiple (LCM) for 30 20 40 is 120.
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Since 30 is a multiple of 6 and is always the smallest multiple of itself, the least common multiple of 6 and 30 is 30.