A Four Game Series

**The probability that the NL wins in 4 games = (1/2)^4 = 1/16 = 0.0625**
Game 1	Game 2	Game 3	Game 4

P(NL wins) = 1/2	P(NL wins) = 1/2	P(NL wins) = 1/2	P(NL wins) = 1/2

**The probability that the AL wins in 4 games = (1/2)^4 = 1/16 = 0.0625**
Game 1	Game 2	Game 3	Game 4

P(AL wins) = 1/2	P(AL wins) = 1/2	P(AL wins) = 1/2	P(AL wins) = 1/2

The probability that the series ends in 4 games =
P(NL wins in 4 games) + P(AL wins in 4 games) = 0.0625 + 0.0625 = 0.1250

Return to the analytical solution.

Or go straight to the explanation page for a 5 game series.