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An urn initially contains 4 white and 5 black balls. Each time a ball is selected, its colour is noted and it replaced in the

An urn initially contains 4 white and 5 black balls. Each time a ball is selected, its colour is noted and it replaced in the urn along with another ball of the same colour. Say we draw three balls. (a) What is the probability that the first two balls selected are black, and that the third one is white?(b) What is the probability that exactly one of the balls selected is white?

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