It is: 21
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42, the answer to all questions!
The least common multiple of 2 , 3 , 7 = 42
The lowest common multiple (LCM) is: 210
Least Common Multiple (LCM) for 3 7 14 is 42
21 = 7 x 3 , 9 = 3 x 3 ; for the Least Common Multiple (LCM), 21 already is a multiple of 7. 21 & 9 have a common factor of 3, so LCM = 21 x 3 = 63