There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions.
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A common denominator, though the least, is 48.
The least common denominator (I think you mean least common multiple) of 2, 8, and 6 is 24. 24 is perfectly divisible by 2, 8, and 6, leaving no remainder in any case.
120
48
72