Spy problem

Logic Level 2

There are three peoples , Albert, Brad and Ken, 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.

They are brought before a judge who wants to identify the spy.

Albert says: "I am not a spy."

Brad says: "I am a spy."

Now Ken is in fact the spy. The judge asks him: "Is Brad really a spy?"

What should Ken say so that he doesn't convict himself as a spy?


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