The least common denominator for 4 5 and 11 is 1.
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12 is.
The LCD of 11/6 and 2/4 is 12.
There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions.
A common denominator, though not the least one, is 6*4 = 24.
A common denominator, though the least, is 48.