a logic puzzle for you all

[Roobi]

One of my favorite logic puzzles. I love stumping people for hours with this one. See if you can work it out. please don't spoil it if you know the answer.

four prisoners are arrested for a crime, but the jail is full and the jailer has nowhere to put them. He eventually comes up with the solution of giving them a puzzle so if they succeed they can go free but if they fail they are executed.

The jailer puts three of the men sitting in a line. The fourth man is put in a seperate room and he gives all four men party hats (as in diagram). The jailer explains that there are two red and two blue hats. The prisoners can see the hats in front of them but not on themselves or behind. The fourth man in the room can't see or be seen by any other prisoner. No communication between the men is allowed.
the jailer tells them that if one of them can answer difinitively (no guessing allowed) and say aloud to the jailer what colour hat he has on his head all four prisoners go free.

http://img258.imageshack.us/img258/9933/hats.png


See if you can work out which prisoner would be able to answer correctly, being one hundred percent sure he is right.

Cheers guys hope you have fun.



-Edit- keep in mind theres no trick involved, it's pure logic.

[troypiggo]

A. He's Superman and can see through the wall to know what D is wearing as well. Easy.

[DarkRevenge]

Ok, I think I have the answer :D. Took me 15 minutes more or less to realize :/
I love logic games! Post more whenever you can and thx a lot for this one, it was a really good one :thumbsup:

[Roobi]

lol troy piggo. no hes not superman. they are all normal people. There is no trick at all to this, but it is a tough one.
dark revenge, can you pm me with the answer, i've never seen anyone get it that quick before, im interested to know if you have it right.

keep trying guys. :D

[DarkRevenge]

First time I sent a PM. Tell me plz if you have recieved it :S

[Roobi]

well done Luis you got it very quickly.
to everyone else feel free to ask any questions you have but remember the vital points. They can only see forward. they can not turn around or talk to each other and the prisoner in the room is locked away, no one can see him and he can see no one else, he can not even see his own hat.


have fun. :D

[Roobi]

heres another, not quite as good as the first, but still fun.


There is a room with no doors, no widows, nothing inside it at all and a man is hung from the beam in the ceiling and a puddle of water is on the floor. How did he die?

[troypiggo]

Simple. He's Superman. He flew up to the ceiling, put rope with Kryptonite in it around neck and hung himself. He was sad because he wasn't the one that could solve your first puzzle. B was. ;)

[mswhin63]

I hope I figured it out, sent a PM.

[Roobi]

lol troy, sorry there are no supermen in these puzzles, but good guess.

:P

[issdaol]

Heh heh,

Nice little puzzle :) :thumbsup: Can I say that it is definately not they guy in the room?

Cheers

[Roobi]

you could if thats what you think, but i won't give anything away here so i dont spoil anything. :P when i get right answers, i'm pm-ing the person to let them know if theyre right or wrong.

[PCH]

Roobi,

sent a pm - do I win the prize :thumbsup:

[Roobi]

lol, sorry.


Just so you all know, they can't take they're hats off to see the colour.

[DarkRevenge]

I can't participate in this one because I already know the answer (I think I've read it in the Internet)... what a pity :sadeyes:

Anyway, I'm going to send you a PM with a logic puzzle so as you can try to sort it out (If you don't know it yet) or post it if you want.

Cheers, Luis.

[PCH]

bummer - thought I had it there. So far it's Argentina 1 - Rest of World 0.

Go Luis :thumbsup:

[Roobi]

lol congrats to those who have gotten it right. It's a toughie, took me a while too. luis, i'm always up for more puzzles, would love to hear it.

[Octane]

You have six matchsticks.

Make 4 equilateral triangles.

H

[Archy]

I can do eight: does that count

[Roobi]

lol. heres another one guys, brought to you by luis.

A man lives on the tenth floor of a building. Every morning he takes the elevator down to the 1st floor and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator - or if it was raining that day - he goes back to his floor directly. Otherwise, he goes to the seventh floor and walks up three flights of stairs to his apartment. Can you explain why?

Hope this brings you some more fun and thanks again luis.

I think i've heard most of the logic puzzles out there, not to mention some weird and wonderful games. If your near someone at the moment, see if you can do this:
cross your arms over each other in front of you. turn your palms so they face, then put your hands together and link your fingers. bring your hands down and then up between your arms so that you now have your wrists crossed and your fingers linked at your chest. Get someone to point to a finger one by one, but not touch them, and see if you can wiggle it.
Your brain has a tough time with this.

[Roobi]

let us know how you go with the backwars finger one. its a crack up and i'd love to hear how you did.

[Allan_L]

That is a great Puzzle Roobi.
Thanks for posting it. :thumbsup:

[bobson]

Here are many more, I like jumping frog puzzle :)
It says 8-10 years old for 6 frogs and it didnt take me long to figure it out but man 8 frogs is really hard.

http://www.puzzlepixies.com/difficult/difficult/jumping-frogs.html

cheers

bob

BTW

Roobi,

Your puzzle requires that prisoners can think ;)

Good one though


Here is one for you:

There are two tribes: truth tribe and lying tribe. Truth tribe always tells truth and lying tribe always tells lies.
Now, you want to get to truth tribe. You take a road to get there and road splits into two roads. Just there where road splits there is a man from one of the tribes. You dont know to which tribe this man belongs to. You are allowed to ask this man only one question to get to truth tribe!
What question would you ask this man to get to truth tribe?

[norm]

The puzzle is completely unfair to prisoner D. He has no chance of making any logical deduction. Does the jailer let him off ?:rofl:

Cheers Norm.

[Roobi]

yeah your right norm. Poor D has to just sit and hope.

[issdaol]

:) Reminds me of Dr Who and The Pyramids of Mars episodes :D

[cfranks]

Took me 10 seconds, but I didn't win Lotto!

Charles

[Roobi]

lol. well done to all of you who got it right, for those that haven't yet keep trying. Did anyone try that finger wiggle one, or did i explain it badly. :P

[Jen]

Dam it Roobi, hows a girl supposed to do this after a few drinks and at 2:30 in the morning :screwy::screwy:
:lol::lol:

[Morepower]

This had me believing there was not a solution, untill I realised It could be read 2 ways.

It says: "The jailer puts three of the men sitting in a line. The fourth man is put in a seperate room and he gives all four men party hats (as in diagram). The jailer explains that there are two red and two blue hats. The prisoners can see the hats in front of them but not on themselves or behind. The fourth man in the room can't see or be seen by any other prisoner. No communication between the men is allowed.
the jailer tells them that if one of them can answer difinitively (no guessing allowed) and say aloud to the jailer what colour hat he has on his head all four prisoners go free."

I read into it that "he" was the prisoner in the room, not "any" of them could definitley say what colour their own hat was.

[Roobi]

Oh sorry guys.
"and say aloud to the jailer what colour hat he has on his head all four prisoners go free."

i realise this could sound a little ambiguous but it's actually not suppose to be. There is only one of the prisoners that is able to be 100% sure of what colour hat he himself is wearing. You can count out D as he is in the room on his own and can't be seen or see anyone else.


I'll post the lot again so people don't have to find the original post.

four prisoners are arrested for a crime, but the jail is full and the jailer has nowhere to put them. He eventually comes up with the solution of giving them a puzzle so if they succeed they can go free but if they fail they are executed.

The jailer puts three of the men sitting in a line. The fourth man is put in a seperate room and he gives all four men party hats (as in diagram). The jailer explains that there are two red and two blue hats. The prisoners can see the hats in front of them but not on themselves or behind. The fourth man in the room can't see or be seen by any other prisoner. No communication between the men is allowed.
the jailer tells them that if one of them can answer difinitively (no guessing allowed) and say aloud to the jailer what colour hat he has on his head all four prisoners go free.

http://img258.imageshack.us/img258/9933/hats.png (http://img258.imageshack.us/img258/9933/hats.png)

[Sharnbrook]

Which country is this? A JAILER has the power of either executing all 4 men, or letting them go if they can answer a logic puzzle!! Even the most despotic regimes don't go that far. I think this should be referred to the Hague.

On second thoughts, sometimes there isn't much logic exercised there, and they might agree and recommend world wide acceptance of the policy.

[Roobi]

lol mike. too true, maybe its happening on another planet, the prisoners do look a little like aliens with hats on.

[bobson]

What if prisoner "B" is not that smart?

:)

[blindman]

Forum name is the clue.
Is that coincidence?
rgds

[Gallifreyboy]

I agree, one of my favourite episodes that one. Prisoner B does need to be smart and hope prisoner A is sighted.

[Roobi]

lol, no the topic name is not a clue.