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One Native, Two Roads (Posted on 2006-05-22) Difficulty: 3 of 5
You are lost once again in the land of Knights, Knaves, and Liars, and once again you find yourself at a fork in the road. You know that one path will lead you to a safe return home, while the other will lead you to your own gruesome demise. (You really need to find a better vacation spot next year!)

Standing at the fork is a native, who might be either a Knight (who always tells the truth), a Knave (who alternates between true and false statements), or a Liar (who always lies). You have no way of knowing which he is. Worse yet, you realize that if he is a knave, you don't know if he will tell you the truth first, and then lie, or lie first and then tell the truth, etc.

What is the fewest number of questions you have to ask to find out which is the safe road, and what are they?

See The Solution Submitted by tomarken    
Rating: 3.8333 (6 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Just a guess | Comment 16 of 21 |

One question

If I had asked a person identical ( type ) to you which is the safe road for me which road would he have pointed to.

Knight - Knight - yes yes

Knave - Knave - yes yes, no no

Liar - Liar - no no

They will all point to safe road.


  Posted by Salil on 2006-05-28 01:56:58
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