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The Least Common Multiple of 18 and 21 is 126.
its 105
The LCM (lowest common multiple) for 15 and 21 is 105. 15; 15, 30, 45, 60, 75, 90, 105, 120 21; 21, 42, 63, 84, 105, 126
The Least Common Multiple (LCM) of (15, 21 and 27) is 945.
The lowest common multiple - is 42 !