SOLUTION: Instructions: Identify the premises and the conclusion. Also find the structure and then use truth tables to evaluate validity or invalidity. Finally provide your translation schem

Question 976057: Instructions: Identify the premises and the conclusion. Also find the structure and then use truth tables to evaluate validity or invalidity. Finally provide your translation schema.
Problem: There are only three possibilities: either your sister is mad, or she is telling lies, or she is telling the truth. You know she does not tell lies, and she is obviously not mad, so we must conclude she is telling the truth. (C. S. Lewis, `` The Lion, the Witch, and the Wardrobe'')
Answer by t0hierry(194) (Show Source): You can put this solution on YOUR website!
The conclusion (she's telling the truth) is the same as the premise (she is not telling lies), so we have proved nothing.
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