==> logic/smullyan/fork.three.men.p <==
Three men stand at a fork in the road.  One fork leads to Someplaceorother;
the other fork leads to Nowheresville.  One of these people always answers
the truth to any yes/no question which is asked of him.  The other always
lies when asked any yes/no question.  The third person randomly lies and
tells the truth.  Each man is known to the others, but not to you.
What is the least number of yes/no questions you can ask of these men and
pick the road to Someplaceorother?  Does the answer change if the third
man randomly answers?