Knights And Knaves

  • Posted by  Downloadmela 
    10 Feb, 2012

    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?

    Alex is a Knight
    Brook is a Spy
    Cody is a Knave

    Brook 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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