One more question about probability problem

[Melissa79]

If two teams are evenly matched, what is the probability that one of the teams will win at least one game in a best out of 3 game series?

 

[Gene]

Are you sure the problem is stated correctly? Unless the games are all ties one team always has to win.

 

[tkhunny]

If two teams are evenly matched, what is the probability that one of the teams will win at least one game in a best out of 3 game series?

Do you mean, "What is the probability that it won't be a sweep?" or "What is the probability that it will go to game three?"

Any such question is easily answered from your tree. You already did that. Just count the ones that have three games.