perplexus.info :: Liars and Knights : A trial

A trial (Posted on 2002-05-02)

Three people, A, B and C, (each one of whom is either a Liar or a Knight) are brought before a tribunal for a crime that was commited.

The court records have since been partially lost, and it is only known that A testified that C was the guilty one. The testimony of the other people is unavailable.

It is known that as the court found that only one of the people turned out to be a Knight, but that he was also the one guilty of the crime.

Who was it?

Submitted by levik

Rating: 2.5833 (12 votes)

Solution: (Hide)

Since the guilty party was a Knight, it could not have been A, since he testified that the crime was commited by someone else. (If he was a Knight and was guilty he would have to admit his guilt.)
So A was a Liar. Which means that his testimony about C's guilt was false, and C was also innocent (though a Liar as well).
That leaves us with B who must have been the honest culprit.

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
The guilty person	Math Man	2013-02-11 11:25:20
Sol	Andre	2010-06-04 17:09:55
Puzzle Solution	K Sengupta	2008-05-08 14:20:27
Answer	K Sengupta	2008-05-06 14:38:37
Solution	Lewis	2003-05-31 23:28:43
The conviction of B when A and C get acquitted	Tim Axoy	2003-03-20 01:46:50
re: It is Person ___	Gamer	2003-03-10 14:45:13
EASY!	Mickey	2002-06-25 15:52:43
It is Person B	jamski	2002-05-07 20:56:22

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