The factors of 21 are 1, 3, 7 and 21.
The factors of 18 are 1, 2, 3, 6, and 18.
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The least common multiple of the numbers 18, 21 and 36 is 252.
The least common multiple of the numbers 7, 21 and 18 is 126.
The least common multiple of 36 , 21 , 18 = 252
The least common multiple of the numbers 7, 18 and 21 is 126.
The LCM is: 180.