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Problem 5 The World Series is a seven-game series that terminates as soon as cither team wins four games. Let X b Series between teams and B; possible valus of X, for example, are AAAA and ABABABB. Assume that the games are independent and the teams are equally matched. Let Y be the nuber of games until the match ends. Find the PMF, py( for Y. e the random variable that represents the outcome of a Worl

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