An inhabitant has been killed in Knavesville and the Sheriff has interrogated four suspects. It is known that one of them is the killer. As is expected of Knaves, they alternated between telling the truth and lying (Not necessarily in that order).

Each suspect was first asked if he was the killer, to which the sheriff got the same answer from all the four suspects.

He then asked them, 'Who was the killer?' The answers to which are shown below.

Abbey said: Bart is the killer.
Bart said: Dean is the killer.
Cody said: Bart is lying when he says Dean is the killer.
Dean said: If Abbey did not kill him, then Bart did.

Who was the killer?

(In reply to 2 solutions? by vj)

I came to the same conclusion as well, though I'm inclined to go with Cody being the killer as the final answer. I think that there's a little loophole to do with this question. If it is safe to assume that the sherrif would take their first answer seriously (afterall, he IS looking for the murderer). Suppose all of them said individually that they were the murderer, then it cancels out the need for the second question, then 'who was the killer?' My mentality was that if they answered 'No' in the first place, then it was required of the sherrif to begin the second line of questioning (unless these Knaves have a death wish in the first place, else normal beings don't admit to their crimes immediately), isn't that right? Which brings us to 'yadda yadda Solution 1'. 

Posted by Faeleia on 2007-04-08 10:47:32