In 1-4, use the fact that in baseball’s World Series, the first team to win four games wins the series.
Suppose team A wins the first three games. How many ways can world Series be completed? (Draw a tree.)
The ways the world series can be completed if A wins the first three games.
A wins the first games.
Now, the number of ways that can win the game is tile number of possible ways where may win the fourth game and be declared as the winning team. Since may lose the fourth game and win in the fifth game, the procedure continues.
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