Knights And Knaves
There are three people (Alex, Brook and Cody), one of whom is a knight, one a knave, and one a spy. The knight always tells the truth, the knave always lies, and the spy can either lie or tell the truth.Alex says: "Cody is a knave."Brook says: "Alex is a knight."Cody says: "I am the spy."Who is the knight, who the knave, and who the spy?SolutionAlex is a KnightBrook is a SpyCody is a KnaveBrook is not the knight, since if he is, then Alex would also be the knight.Cody is not the knight, since his statement would then be a lie. Therefore Alex is the knight. Hence Cody is the knave, and Brook is the spy.
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