It's 126.
-- the 6th multiple of 21
-- the 9th multiple of 14
-- the 14th multiple of 9
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The LCM is 441.
The LCM of 9, 21 and 24 is 504.
For the values: 21, 14 the LCM is: 42
The Least Common Multiple (LCM) for 9 21 15 is 315.
The Least Common Multiple (LCM) for 21 3 9 is 63.