A box contains r red balls and b blue balls one ball is, Ask an Expert

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A box contains r red balls and b blue balls. One ball is selected at random and its color is observed. The ball is then returned to the box and k additional balls of the same color are also put into the box. A second ball is then selected at random. its color is observed, and it is returned to the box together with k additional bans of the same color. Each time another ball is selected, the process is repeated. If four balls arc selected, what is the probability that the first three balls will be red and the fourth ball wil1 be blue?

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