LCD(11, 9, 6) = 198
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LCD(5, 6, 11) = 330
The common denominator is 66.
The LCD of 11/6 and 2/4 is 12.
Answer: 30 If those numbers are denominators, the least common denominator is the least common multiple of the three. In this case, 30 is the LCM of 6, 10 and 15, so 30 is the least common denominator.
A common denominator, though not the least one, is 6*4 = 24.