252 is the LCM of 21, 84, and 126.
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The LCM of 21 and 18 is 126.
The LCM is 84.
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
Least Common Multiple (LCM) for 4 14 21 is 84.
84