6-36. Suppose that for a large number of red and blue marbles within a jar the probability...

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6-36. Suppose that for a large number of red and blue marbles within a jar the probability of obtaining a red marble is 1 4 and the probability of getting a blue one is 3 4 on any given draw. Marbles are selected from the jar until the fourth red marble is observed. What is the probability of observing the fourth red marble on the tenth draw? What is the probability that at most nine marbles have to be drawn in order to find the fourth red one?

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