Correct solutions from outside the Bradley University community were received from Ahmed AboAdham, Steven Young, Juan Carlos Marivela, Paul Lee, Paul Botham, Nick McGrath, Dan Dima, Jérôme LeFebvre, Lou Cairoli.
In any series that goes to seven games, the first six games
must have split three for each team. This can happen in
= 20 ways. There are a total of 26 ways in which these six
games can be played. Therefore the probability of the World Series going
to seven games is
/26 = 5/16.
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