Re: A funny think happened...
Re: A funny think happened...
- Subject: Re: A funny think happened...
- From: Michelle Steiner <email@hidden>
- Date: Fri, 28 May 2004 00:56:57 -0700
On May 27, 2004, at 11:07 PM, Walter Ian Kaye wrote:
(Hmm, anyone remember the brain teaser about someone giving directions
at a fork in the road, but that person could either be someone who
always tells the truth or someone who never does, and there was some
way of asking so that you could get the right directions either way?)
Yup. There are quite a number of them. Here's one:
A man comes upon a fork in the road. He wants to take the safe fork to
get to town. There is a man standing there that he can ask only one
question of. What question should he ask, so that he would get the
right answer regardless of the answerer lies or tells the truth?
The question he should ask is "If I were to ask you which is the safe
path to town, what would your answer be?"
He should take the path the person says. Here is the reasoning,
assuming that the path is the right-hand path:
If the path is the right path and the responder tells the truth; he
would answer "the right path," because that's what he would answer if
directly asked, and therefore would say that's the answer he would
give.
If you asked the liar which path is the safe path, he would answer that
it is the left path. So if you asked him what he would answer, he
would lie and say that he would say the right path. In other words, he
would lie about the lie.
-- Michelle
--
"There's some good in the world, Mr. Frodo, and it's worth fighting
for."
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