perplexus.info :: Liars and Knights : Escaping the dungeon

Escaping the dungeon (Posted on 2002-04-26)

You are trapped in a dungeon, and see two doors in front of you. One is a way out, andther will lead to certain death.

Two people are standing in front of these doors, one of them a Knight, another - a Liar. Naturally, you do not know who is who, but they know each other's true nature.

Both the people know which way is correct, but you can only ask one question of one of them before making your choice. What will you ask?

Submitted by levik

Rating: 3.0000 (18 votes)

Solution: (Hide)

Ask: "Which door will the other person tell me to use?"
No matter who the person you ask is, they will point to the door leading to death.
Take the other one.

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

Subject	Author	Date
Solution	Praneeth	2007-08-29 02:40:36
re(2): Puzzle Solution	K Sengupta	2007-05-21 11:32:01
re: Puzzle Solution	JayDeeKay	2007-05-16 13:21:23
Puzzle Solution	K Sengupta	2007-04-17 11:11:07
No Subject	K Sengupta	2007-04-17 11:07:33
Different question	CharleyA.	2007-04-10 15:24:39
Old one	Paddy	2005-12-23 04:23:18
re: Labyrinth	Brandon	2005-05-16 14:05:17
Way way to easy	ron	2004-12-31 17:13:47
I have heard this...	logischer Verstand	2004-05-04 17:22:49
An Alternative Dungeon Problem Solution	Gordon Steel	2003-08-28 15:11:42
perhaps...	Lewis	2003-05-04 20:46:37
If and only if Door A	Tim Axoy	2003-03-19 07:16:07
re: I will ask...	toekie	2003-01-16 08:00:38
I will ask...	rhea	2002-12-28 18:53:18
Labyrinth	cges	2002-12-05 08:41:27
re: I got it...	Kristina	2002-09-03 09:51:40
the answer	Kristina	2002-09-03 09:49:56
Me too.	Carey	2002-05-31 02:40:19
I got it...	John	2002-05-01 05:31:48

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