World Series of Baseball

[Guest]

so in the world series youve got two teams and the series ends when one team wins its fourth game
the teams are say equally likely to win any one game
what is the probability that the series will last exactly four games?
five games? six games? seven games?

if i know 4 i could figure out 5 6 and 7 of course

thanks

 

[tkhunny]

Draw a tree.