1. The problem statement, all variables and given/known data When two teams meet in the World Series, they play a series of games which stops when one team has won four games (a "best-of -seven" series). The team in the World Series are A and B. (a) If the two teams are evently matched, what is the probability that the World Series ends in only four games? (b) Again assuming they are equally matched, what is the probability that team A wins games 1,2,4 and 7 (and thus the World Series) and the team B wins games 3, 5 and 6? (c) Again assuming they are equally matched, what is the probability that A wins the World Series in seven games? (d) if the probability that A wins any given game against B is 1/4, what is the probability that A wins the World Series in either four of five games? 2. Relevant equations 3. The attempt at a solution Ans for a) (1/2)^4 I don't know how to solve the problem after a). Please help. Thank you.