Impossible to answer - the word 'common' means you need to be comparing it to something else !
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36
36
LCD(4, 9) = 36.
36
Oh, dude, the common denominator for 4, 2, and 9 is like the smallest number that all three can divide evenly into. So, in this case, the common denominator would be 36 because 4, 2, and 9 can all divide evenly into 36. Math can be chill sometimes, right?