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30 is the LCM (least common multiple) of 15 and 30, since 30 is the smallest number evenly divisible by both 15 and 30. Please see Related Link for a handy LCM calculator.
LCM is smallest number 15 and 30 are both a factor of, in this case 30.
15 x 2 = 30
30 x 1 = 30
The LCM of 15 and 30 is 30.
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