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brain teaser

M

MR.?

New member
This question was given to my literature class.

Probably a few of you have seen this questoin before.
If you have......... give your answer and dont ruin the surprise.

This question was given to 2nd graders and graduate students at Harvard.

It tests your critical thinking ability. The 2nd graders answered the test faster and more acurately than the Harvard students.

Here it is:

Your locked in a room with a group of people. There are no windows, only a door.

This door is locked shut. The door can only be opened by pushing one of the two buttons on the wall.(button A &B).

The switches are connected to a explosive device. If you push the wrong button you will detiate the bomb.

There are two computer in the room(computer A&B). These computers will assist in determining what button is the correct one to choose.

!!!!!One of the computers will always tell the truth and one will always lie.....there is no way how to determine which one is the correct computer.

You have ONE question to ask ONLY ONE computer. If you ask the correct question....you will find out what button to choose without blowing up the room.

i know this may be easy for some of you...it took me 1/2 hour to figure it out.

i was bored....
 
Last edited:
Ask which switch is hooked to the bomb. Both will give the same answer.
 
THat would be too easy Scrappy....that's the point of the brain teaser....there is one right answer that is hard to come up with but will seem obvious when we hear it I guess.
 
Hmmm

Just ask either of the computers what the other computer would say in reference to the button that will detonate the bomb.
 
Here are some hints.

* one will lie, the other will always tell the truth
---- this should help you choose your answer
* however, it doesnt matter which computer you ask
 
Will pushing switch (A) to open the door kill me?
 
A similar brain teaser... you are lost in the woods that is inhabited by 2 tribes..One tribe is friendly and will always tells the truth...the other tribe are cannibals and will always lie..you run into a tribesman (unknown which tribe) and get to ask him one question..what question do you ask??
 
thefantom1 said:
A similar brain teaser... you are lost in the woods that is inhabited by 2 tribes..One tribe is friendly and will always tells the truth...the other tribe are cannibals and will always lie..you run into a tribesman (unknown which tribe) and get to ask him one question..what question do you ask??
Click to expand...

Do you prefer your people raw or cooked?

If it were a friendly one they'd be disgusted.
 
the fantoms ---- Is that A1, you trying to rub all over me?
 
Happy Scrappy,

You are making this more difficult than it needs to be. The thought process behind the question is rather basic.

remember 2nd grade kids answered fast and more acurately than the Harvard students. when i first read the question....i was thinking of complex ways to answer the question....you have to think simple and like a child.

booger....your right on track.
 
Computers

This shit gives me a headache. But what it comes down to is whatever button the computers tell you will cause the detonation, you pick the opposite button. It's kind of hard to put in words.

Damn computers. This whole thing is based on the premise that the computers know what the other computer will say and react accordingly.

I got to go. I'll check back tomorrow if no one has put this double negative logic out here then I'll take a stab at it.
 
I think booger said it first--ask either computer "what would the other computer say is the safe button?" Going by this we know that the lying computer will recommend the opposite of what the other will say and the truthful computer would recommend exactly what the other will say. So if you happen to ask the lying computer what the truthful computer would say, he'd give the opposite and tell you the bomb button. If you asked the truthful computer what the lying computer would say, he'd give the truth. Either way you find out which button is the safe button.

However, if the computers aren't networked then that's a whole different paint job.
 
How about this? The question stated "You only get ONE question to ask ONE computer." Since I am not the only person in the room, I can ask one question, then someone ELSE can ask another question. I could ask something along the lines of "Am I asking you a question" to computer A. If it says yes, then it is the truthful computer and the next person can ask which is the correct switch. If A says no, then it is the lying computer and the next person can ask computer B which is the correct switch (or ask A and pull the other switch).
 
booger is correct.

the is answer is very simple

children tend to use critical thinking skills better than their adult conterparts. adults tend to look for complex methods to solve problems.

it took me while and many stupid question before i realized i was thinking to complex.
 
If Booger is correct then the question you ask is, " Which button will detonate the bomb" then you go with the opposite button it tells you??
 
Pimp C said:
If Booger is correct then the question you ask is, " Which button will detonate the bomb" then you go with the opposite button it tells you??
Click to expand...

That can't be right either, because what if the computer you ask is telling the truth?
 
you ask one of the computers what the other computer will tell you to push, to open the door....and choose the opposite.
 
THE STEEL BEAST said:
'there is no way how to determine which one is the correct computer. "
Click to expand...

Yes there is.

Your question: "Will I die if I push button A?"

Computer B: "No."

*push button A*

*die*

Conclusion: Computer B was lying.

-Warik
 
If the computer you ask happens to be the liar:
Me: If I ask the other computer what button to push what would it say?
Lying computer: A
THen you go with B because that one is lying and the other one would of said the opposite.

If the computer you ask happens to be the one that tells the truth:
Me: If I ask the other computer what button to push what would it say?
Truth computer: A
Then you go with B because the other computer lied (said A)


Does this help? Is this even right? I don't know but I gotta headache now, Good lookin out.
 
The Question

Ask either computer this question.

"What will the other computer say is the Safe-Button".

The truthful computer will tell you that the lying computer will tell you the Bomb-Button because he knows the lying computer will lie. Pick the other button.

The lying computer will tell you that the truthful computer will tell you the Bomb-Button because he knows the truthful will tell the truth so he lies about what the truthful computer will say. Pick the other button.

No matter what the answer pick the other button. My head hurts now. The answer isn't that difficult. It's explaining it that's the hard part.
 
maybe I'm missing something HappyScrappy....but wtf are you talking about?.....you're thinking too hard....


Follow me....YOU ask Comp A: what will Comp B say the safe button is?
Comp A answer: B

Now....Lets say YOU asked Comp B: What will Comp A say the safe button is?
Comp B answer: B


PICK THE OPPOSITE...IT DOESN'T MATTER WHICH ONE YOU ASK....YOU DON'T HAVE TO KNOW WHICH COMP IS TELLING THE TRUTH OR LYING..IT'S IRRELEVANT..ALL YOU HAVE TO KNOW IS THAT ONE COMP DOES LIE AND THE OTHER DOES TELL THE TRUTH THOSE ARE THE ONLY 2 VARIABLES YOU NEED TO KNOW, IT DOESN'T MATTER WHICH ONE...PICK THE OPPOSITE....:D
 
steel beast

---<snip>
you ask one of the computers what the other computer will tell you to push, to open the door....and choose the opposite.
---</snip>

so this presents two scenarios

1) The computer you're asking is the computer that lies. That computer will reverse the information provided by the other computer, making it the false statement. Therefore you choose opposite the answer.


2) The computer you're asking is the computer that tells the truth. That computer will correctly inform you with the wrong answer that the lying computer provided. Therefore you choose the opposite button.

This is the correct answer to ask.
 
constants:

Button Red is correct
Computer A lies

Question:

"Computer A, what would Computer B tell me to push?"

Computer B would reply Red - because that is correct (constant). Since Computer A lies (constant), it would reply to you to press the green button. So you do the opposite.

--or--

constants:

Button Green is correct
Computer A tells the truth

"Computer A, what would Computer B tell me to push?"

Computer B would reply Red - because Computer B lies (constant). Computer A would tell you to push Red as well, because it is answering the question truthfully (constant). So you do the opposite.

No real need to get into logic operations involving numbers. It's just a simple problem.
 
you didn't do the opposite, as in Mr?'s answer to the teaser.

And there's nothing about getting a response from only one computer - it's that you can only directly ask one computer a question. There's nothing about asking one computer to ask the other.

The whole point is this:

You ask one computer what the other would say.

Either the computer you're asking directly is going to lie, or when the computer you ask directly asks the other computer - that one will lie. So, you always do the opposite.
 
thefantom1 said:
A similar brain teaser... you are lost in the woods that is inhabited by 2 tribes..One tribe is friendly and will always tells the truth...the other tribe are cannibals and will always lie..you run into a tribesman (unknown which tribe) and get to ask him one question..what question do you ask??
Click to expand...

You ask him which way to his tribe....
 
Steel Beast,

I was confused just as you are now. I went through a complicated thought process and always came up empty.

Its hard to believe the answer due to its simplicity.

All the needed info was given properly and the answer is correct.
 
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