The following two facts are known about Adam, Bert, and Carl:

1) Of Adam, Bert, and Carl, there is one knight, one knave, and one liar.
2) Adam said once, "Bert said that Carl isn't a knight."

Can you ask one yes/no question to one person and figure out who is who? If not, how many questions must you ask?

Lets assume that the statement is true. THats would mean that neither Adam nore Bert are liars. That leaves Carl as the liar, and since he is not a knight, the statement is still true. Now just ask Adam or Bert if they are the Knight. If Adam says yes, then adam is a knight Bert is a Knave carl is the liar> IF he says no, then Adam is the Knave and bert is the Knight, carl would still be the liar. You can also bert the same question.

Posted by joshua imperato on 2005-02-18 18:49:49