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Home > Logic > Liars and Knights
A trial (Posted on 2002-05-02) Difficulty: 2 of 5
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?

See The Solution Submitted by levik    
Rating: 2.5833 (12 votes)

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Solution Puzzle Solution | Comment 7 of 9 |
(In reply to Answer by K Sengupta)

Assume that A is guilty. If so, then A would admit his guilt since it is known that the guilty individual is a Knight. However, A testified that someone else committed the crime. This is a contradiction.

Accordingly, A is innocent and therefore his statement about C being guilty must be false, so that C is also innocent.

This leaves B as the knight and the guilty individual.

  Posted by K Sengupta on 2008-05-08 14:20:27
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