IT-CESENATICO 1987 Problem 6
There are three balls of distinct colors in a bag. We repeatedly draw out the balls one by one, the balls are put back into the bag after each drawing. What is the probability that, after drawings, (a) exactly one color occured? (b) exactly two oclors occured? (c) all three colors occured?
Dataset text AI-MO AoPS. Quoted with source.
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