The tree diagram shows the possible win/loss paths for a basketball team playing in a
tournament. Harris High School loses 1 game in the tournament. How many ways could
this happen?

The tree diagram shows the possible winloss paths for a basketball team playing in a tournament Harris High School loses 1 game in the tournament How many ways class=

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The ways that they could lose exactly one game in the tournament are... WWL, WLW, and LWW. 
There are 3 ways that could happen
There are 3 ways that is possible.

If you go to the WIN from start, you can either go to another win then a loss, or vice versa. There is 2 ways if you win the first game.

If you loose the first game, then you have to win the second and third to only has 1 loss. That's the only way you can go for 1 loss if you loose the first game.

Together, that's 3 ways: WWL, WLW, and LWW