LCD stands for Lowest (or Least) Common Denominator.
The LCD for a set of two or more numbers is the least number such that each member of the set is a factor of the LCD.
So, for example, given the set {2, 4, 5},
LCD{2, 4, 5} = 60 since 2*30 = 60, 4*15=60 and 5*12 = 60. No non-zero number smaller than 60 is a multiple of all three members of the set.
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http://en.wikipedia.org/wiki/Lowest_common_denominatorcheck above link.good explanation
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Communitive means of, or belonging to, a community. It has no meaning in math. Communative does not mean anything - in math or elsewhere.
the mean is the average
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