What is the expectation of X?
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An urn holds 4 red, 3 blue, and 2 green marbles.
Three marbles are selected, altogether, without replacement.
Let X be the number of different colors obtained.
(For example, if you get 3 blues, then X = 1, but if you get 2 reds and a green, then X = 2.)
What is the expectation of X?
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