The least common multiple of 75 and 105 is 525.
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The LCM is: 525
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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 LCM is 75.
The LCM of 15 and 75 is 75.