24. The probability mass function of X is given by

Give a possible interpretation of the random variable X.
Hint: See Exercise 23.
In Exercises 25 and 26, suppose that two teams are playing a series of games, each of which is independently won by team A with probability p and by team B with probability 1 − p. The winner of the series is the first team to win i games.

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p(k) = (+-)p(1 - p)*, k=0,1,...