LCD means lowest (or least) common denominator, and that implies there must be at least two fractions involved for something to be common to both of them. There is, therefore, no sensible answer to this question.
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LCD(8, 11, 9) = 792
since 9 and 11 have no common factors, the LCD is 99
LCD(11, 9, 6) = 198
lcd(9, 6) = 18.
LCD(4, 8, 11) = 88.