Two athletic teams playa series of games; the first team to win 4 games is the winner. Suppose that one of the teams is stronger than the other and has probability p [egual to (i) 0.5, (ii) i] of winning each game, independent of the outcomes of any other game. Assume that a game cannot end in a tie. Find the mean and variance of the number of games required to conclude the series. (Use exercise 3.26 of Chapter 3.)