
The solution of the statement of indirect proof.

Explanation of Solution
Given information:
When Katsu left to get in the concession line before the end of the first half of a basketball game, her school’s team was winning
Calculation:
In an indirect proof or proof by contradiction, assume that the conclusion is false. By showing the assumption to be logically impossible, prove the assumption is false and the original conclusion is true. For this problem, assume that a player for the other team earned three points with the combination of a two-point basket and a foul shot.
The other team scored
Following steps are used for the indirect proof are as shown below:
Firstly, assume that a player for the other team made a two-point basket and a foul shot.
Secondly, the other team’s score before Katsu left was
The score is correct when will assume that the other team made a two point basket and a foul shot, so Katsu’s assumption may not be correct. The other team could have made a three point basket or a two-point basket and a foul shot.
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