The solution of the statement of indirect proof.
Explanation of Solution
Given information:
A computer game involves a knight on a quest for treasure. At the end of the journey, the knight approaches the two doors shown below:
A servant tells the knight that one of the signs is true and the other is false. Use indirect reasoning to determine which door the knight should choose.
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 each sign is true one and a time.
If the sign on the right is true, then the sign on the left must be false. However, it doesn’t contradict the sign on the right so it must also be true. This contradicts the given information the one sign is false.
If the sign on the left is true, then the sign on the right must be false. This doesn’t contradict any information on the signs so this must be the true case.
The door on the left. If the sign on the door on the right were true, then both signs would be true. But one sign is false, so the sign on the door on the right must be false.
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Geometry, Student Edition
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