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A Logic Accusation (Posted on 2003-10-01) Difficulty: 2 of 5
In an island peopled by Knights (who always say the truth) and Liars (who obviously always lie), two persons spoke about each other.

A said: "B would say I lie."

B said: "That is true."

Can anything be deduced as to what kind is each of them?

See The Solution Submitted by Federico Kereki    
Rating: 2.8667 (15 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(2): Solution | Comment 4 of 17 |
(In reply to re: Solution by SilverKnight)

Since what A said would happen did in fact not happen, it seemed clear to me that A must be a liar.

I guess I'm reading the question as if A's statement were: "B will say I am lying." If in fact A is being more general, as in "If you asked B, he would tell you I am a liar" and B replied "that is true", then you probably have to go through cases.

So in the end, I guess I can't disagree with you -- I just read the problem slightly differently.

I think the wording is just a bit ambiguous. "I lie" could mean either "I am lying" or "I tell lies" I took it the first way, and it may indeed be meant in the second.
  Posted by Brian Wainscott on 2003-10-01 15:14:57

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