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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The LCD of 13, 14 and 15 is 2730 The LCD of 1/3, 1/4 and 1/5 is 60
105
LCD(15, 11) = 165.
The LCD of 3,5 and 15 is 15 because they can all go into 15!
10and one fifths