2 x 2 x 3 = 12
2 x 7 = 14
2 x 2 x 3 x 7 = 84, the LCM
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13 is a Prime number so its only factors are 1 and 13. Therefore the lowest common denominator of 13 and 14 is 1.
The LCM is: 84
LCM(6, 12, 14) = 84
The least common multiple of the numbers 7, 18 and 21 is 126.
12 3x4=12 4x3=12 12x1=12
LCM = 84