It is: 126
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The least common multiple (LCM) refers to a multiple that is COMMON to two or more numbers. You have only one number in the question! The least multiple of a number is itself.
The LCM of 2, 3 and 6 is 6.
The least common multiple of the numbers 7, 18 and 21 is 126.
The LCM is: 18
The LCM is 18.