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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.
The least common denominator of 13 and 52 is52
The Least Common Multiple of 4 and 13 is 52.
The least common multiples of 5, 11, and 13 is 715.
The least common multiple of 3 , 8 , 13 = 312