Knights and Knaves Puzzle - Solution
The Puzzle:
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?
Our Solution: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.
So Alex is the knight. And Cody is the knave, and Brook is the spy.
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.
So Alex is the knight. And Cody is the knave, and Brook is the spy.