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A box contains 5 blue balls, 8 red balls, 10 green balls. Ten balls are selected...

A box contains 5 blue balls, 8 red balls, 10 green balls. Ten balls are selected from the box simultaneously. Find the expected number of colors that appear on at least three of the ten balls. I have the answer but don't understand where it comes from.

Math   Statistics-And-Probability   
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