24. The probability mass function of X is given by P M = \ r k - l )PV-P)k, k = 0 , 1 , . . . .

Give a possible intepretation 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 ñ

and by team  with probability 1 - p. The winner of the series is the first team to win / games.