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You are playing Mario Bros. At some point in the game, you have to hit a magic box. The box gives you a mushroom with
You are playing Mario Bros. At some point in the game, you have to hit a magic box. The box gives you a mushroom with a probability of .60, a star with a probability of .20, and a flower with a probability of .20. Every time you play, you only hit the magic box once.
a) What is the probability that you will have to play at least 3 times to finally get a star?
b) If you play 10 times, what is the probability that you get a mushroom at least 8 times?
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