The Least Common Multiple of 18 and 21 is 126.
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7
its 105
The lowest common multiple - is 42 !
The least common multiple of 14 and 21 is 42.14, 28, 42, 56 ...21, 42, 63, 84, ...
7 14 21 28 35 42 49 56 63 9 18 27 36 45 54 63 lowest common multiple therefore is 63.