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1. (12 marks) A box contains 15 black and 20 green balls. One ball at a time is drawn at random, its color is noted,

1. (12 marks) A box contains 15 black and 20 green balls. One ball at a time is drawn at random, its color is noted, and the ball is then replaced in the box for the next draw. a. Find the probability that the first green ball is drawn on the fifth draw. b. Find the probability that the second and third green balls are drawn on the seventh and tenth draws, respectively

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