Two teams, A and B, will play a best-of-seven series, which will end as soon as one

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Two teams, A and B, will play a best-of-seven series, which will end as soon as one of the teams wins four games. Thus, the series may end in four, five, six, or seven games. Assume that each team has n equal chance of winning each game and that all games are independent of one another. Find the following probabilities.
a. Team A wins the series in four games.
b. Team A wins the series in five games.
c. Seven games are required for a team to win the series.
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