perplexus.info :: Liars and Knights : Liar Lock

Liar Lock (Posted on 2013-02-26)

In a remote island there are only two types of people that live on it, Knights and Liars. Knights always tell the truth. Liars always speak falsely.

Five suspects are interrogated in connection with a murder. Their statements are as follows:

Al: "Cal and Dan are lying." 
Ben: "Al and Elmer are lying." 
Cal: "Ben and Dan are lying." 
Dan: "Cal and Elmer are lying." 
Elmer: "Al and Ben are lying."

Which suspect do you know for certain to be a liar?

Submitted by K Sengupta

Rating: 4.0000 (2 votes)

Solution: (Hide)

Al is the only one with a certainly to be the liar.
For an explanation, refer to the analytic solution submitted by Steve Herman in this location..

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

Subject	Author	Date
Logical Solution	Salil	2013-02-28 00:49:44
Full Orthodox Solution (spoiler)	Steve Herman	2013-02-26 13:52:20
computer solution	Charlie	2013-02-26 13:34:37
Orthodox solution (spoiler)	Steve Herman	2013-02-26 13:17:55
Unorthodox Solution	Jer	2013-02-26 12:28:12

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