Professor Z was killed by one of his four students, who was helped by another of the four. His students declared:

A: If B is guilty of something, then C must be innocent.
B: If A is innocent, then C must be guilty.
C: If B was the killer, then D must have had nothing to do with the crime.
D: I am innocent.

As everybody should know, guilty parties always lie, and innocent people always tell the truth. Who killed the professor, and who was his accomplice?

(In reply to full solution by SilverKnight)

So far as I can tell, Silver Knight is correct, except that on row 2 of his table, the t-value under A's statement should be F. (b/c C is guilty as accomplice in that scenario.)

So D killed, and B helped. Is this wrong?

Posted by Matthew Pianalto on 2004-03-09 21:18:16