The Magic Café
Username:
Password:
[ Lost Password ]
  [ Forgot Username ]
The Magic Cafe Forum Index » » Puzzle me this... » » Honesty and lies (0 Likes) Printer Friendly Version

mike paris
View Profile
Regular user
179 Posts

Profile of mike paris
Don,t know if this puzzle has been done before,,,,a house has two opposite doors one leads to safety,the other leads out over a mountainous drop,inside the house is 2 boys,1 always tells the truth 2nd always tells lies,but you don,t know which is which,you ask one question to find out the correct door to go to safety,what is the solution,mike
blazes816
View Profile
Special user
Wichita, Kansas
522 Posts

Profile of blazes816
I know a form of this puzzle, but not this one.
stanalger
View Profile
Special user
St. Louis, MO
996 Posts

Profile of stanalger
A double negative is a positive.

"If I asked you if this is the door that leads to
safety, would you answer 'yes'?"
mike paris
View Profile
Regular user
179 Posts

Profile of mike paris
The one that tells the truth would say ,,,yes but if you asked the other he would say no,,,but you don't know which tells the truth or lies,he he
stanalger
View Profile
Special user
St. Louis, MO
996 Posts

Profile of stanalger
Let's say the door does lead to safety.

If I asked the truth-teller if it led to safety,
he would answer "yes." So when I ask him, "If I
asked you if this is the door that leads to safety,
would you answer 'yes'?", he would have to answer
"yes."

If I asked the liar if it lead to safety, he
would answer "no." So when I ask him, "If I
asked you if this is the door that leads to safety,
would you answer 'yes'?", he would have to
answer "yes."

Similarly, if the door didn't lead to safety,
both liar and truth-teller would have to
answer my question with a "no."
stanalger
View Profile
Special user
St. Louis, MO
996 Posts

Profile of stanalger
A negative times a positive
or a positive times a negative
is negative.

I could also ask, "If I asked the
other boy if this is the door that
leads to safety, would he answer
'no'?"

A "yes" answer to this question
means the door does lead to
safety.
A "no" answer means it doesn't
lead to safety.
mike paris
View Profile
Regular user
179 Posts

Profile of mike paris
Hi stan,i had to go over and over your answer many times,the answer is basically the same just another way of putting it,,,you want to go through the door to safety so you ask boy A what B will say,whatever the answer you take the OTHER door,mike
Jonathan Townsend
View Profile
Eternal Order
Ossining, NY
26994 Posts

Profile of Jonathan Townsend
Quote:
On 2005-07-14 17:55, mike paris wrote:...inside the house is 2 boys,...


Aside from the grammar problem...

First the boys are infants, and unable to talk. Then, sadly the house being on fire and full of smoke, it was a bit too noisy to hear any reply they gave. Oh well. Next.
...to all the coins I've dropped here
mike paris
View Profile
Regular user
179 Posts

Profile of mike paris
So sorry I should have said (are),,,,,,,,,,,,,jonathan,hay man wot iz de problem wid yew (liten up, yoo no wot i,m sayin) so long has yoo understan wot I say,yoo ave to learn to ave respeck for uders hoo are not has clever has yoo,we not alls tawk wiv a plum in de mout,,,, and not be condescending, being courteous costs nothing,lighten up,mike
Jonathan Townsend
View Profile
Eternal Order
Ossining, NY
26994 Posts

Profile of Jonathan Townsend
Honestly your honor, I was in this house with two boys and I was just trying to get them to tell me which door I could use.
...to all the coins I've dropped here
ed rhodes
View Profile
Inner circle
Rhode Island
2699 Posts

Profile of ed rhodes
Find a copy of the Dr. Who episode "Pyramid of Mars" or the film "Labirynth," the puzzle appears in both of those.
s

p

o

i

l

e

r



s

p

a

c

e

Ask either of the people... if I asked HIM (pointing to the other child) if this (Door A) was the safe door, what would he say?

If the boy you ask says the other boy would say "yes," (the door is safe) the door is the dangerous one and should be avoided.


Here's how I think it works out;


If you ask the liar, he knows the other boy would say "no" but he'll lie and say the other boy would say "yes."

If you ask the truth teller, he knows the other boy would lie about the status of the door so he will say "yes."
"He was born with the gift of laughter and a sense that the world was mad." - Rafael Sabatini, Scaramouche
ed rhodes
View Profile
Inner circle
Rhode Island
2699 Posts

Profile of ed rhodes
Did I break the thread?
"He was born with the gift of laughter and a sense that the world was mad." - Rafael Sabatini, Scaramouche
Jonathan Townsend
View Profile
Eternal Order
Ossining, NY
26994 Posts

Profile of Jonathan Townsend
Not broken though a classic re-chafe.
...to all the coins I've dropped here
mike paris
View Profile
Regular user
179 Posts

Profile of mike paris
Mandrake,your answer was correct,stan had already guessed it,mike
ed rhodes
View Profile
Inner circle
Rhode Island
2699 Posts

Profile of ed rhodes
Shoot
"He was born with the gift of laughter and a sense that the world was mad." - Rafael Sabatini, Scaramouche
The Magic Cafe Forum Index » » Puzzle me this... » » Honesty and lies (0 Likes)
[ Top of Page ]
All content & postings Copyright © 2001-2019 Steve Brooks. All Rights Reserved.
This page was created in 0.08 seconds requiring 5 database queries.
The views and comments expressed on The Magic Café
are not necessarily those of The Magic Café, Steve Brooks, or Steve Brooks Magic.
> Privacy Statement <

ROTFL Billions and billions served! ROTFL