Omnimaga

General Discussion => Other Discussions => Math and Science => Topic started by: pimathbrainiac on November 27, 2012, 08:13:58 pm

Title: You think you know this riddle...
Post by: pimathbrainiac on November 27, 2012, 08:13:58 pm
You are in the labyrinth, and you reach the end. There are three gates guarded by three different people. One leads out, and the other two lead to certain death upon opening. One man always tells the truth, one man always lies, and on always tells the truth, but kills anyone who asks tricky questions. You don't know which is which. You can only ask two questions but can ask them to each person once. What questions do you ask how would you ask them?
Title: Re: You think you know this riddle...
Post by: Builderboy on November 27, 2012, 08:29:49 pm
Label the guards 1 2 and 3.  Ask 2 if guard 1 is a liar.  If he says yes, ask guard 3 where the exit is.  If the says no, ask guard 1 where the exit is.

I think those count as non-tricky questions :P
Title: Re: You think you know this riddle...
Post by: Sorunome on November 27, 2012, 08:30:51 pm
but the liar question will always be awnsered with no

EDIT: i missread your post ;)
Title: Re: You think you know this riddle...
Post by: Iambian on November 27, 2012, 08:31:49 pm
(1) Ask the person which one of the others would lie to me. The liar would point out someone else, and you can then use the person not picked to ask the second question to. The truthful person will pick the liar, but since there's only one, you will be guaranteed someone who tells the truth if you pick the unchosen one.

(2) Since the person you are asking this question to is guaranteed to tell the truth, you ask this person which gate will lead you out safely.
Title: Re: You think you know this riddle...
Post by: Builderboy on November 27, 2012, 08:32:04 pm
but the liar question will always be awnsered with no
If you ask the liar if his neighbor is a liar, he will always respond yes because he will be lying.
Title: Re: You think you know this riddle...
Post by: pimathbrainiac on November 27, 2012, 08:32:23 pm
Keep trying: (hint: think of the one that everybody knows, and find a way to reduce the riddle)
Title: Re: You think you know this riddle...
Post by: pimathbrainiac on November 27, 2012, 08:35:18 pm
Iambian: answer that I didn't think of... noice!
Builderboy: I got lost in the wording, but I understand... I also didn't think of that one... there are multiple answers to this one.
Title: Re: You think you know this riddle...
Post by: epic7 on November 27, 2012, 08:43:55 pm
Hm....
Ask each of them what 8+8 is.
Ask whoever says 16 which gate is correct
:P
Title: Re: You think you know this riddle...
Post by: pimathbrainiac on November 27, 2012, 08:45:49 pm
I'm going to make my riddles better from now on...

My answer was overly complicated...
Title: Re: You think you know this riddle...
Post by: Builderboy on November 27, 2012, 08:46:45 pm
Overly complicated?  What about the guy who kills people who ask tricky questions :P
Title: Re: You think you know this riddle...
Post by: pimathbrainiac on November 27, 2012, 08:49:50 pm
The 1st question is: Will you kill me if I ask you a tricky question.
2nd (to the two who answer no): What will the other guy say if I asked him which door to take?

Take the opposite
Title: Re: You think you know this riddle...
Post by: Builderboy on November 27, 2012, 08:54:42 pm
If the first guy you ask is a liar, he will say that yes, he will kill you if you ask him a tricky question (he will be lying).  But you will also get the same response if the first guard is the one who kills people.  If the answer is yes, all you know is that the guard you just talked to is not the guard who tells the truth (but doesn't kill people), you still don't know where the liar is or where the guy is that kills people
Title: Re: You think you know this riddle...
Post by: pimathbrainiac on November 27, 2012, 08:57:06 pm
/me goes to die in a hole because he can't solve his own riddle
Title: Re: You think you know this riddle...
Post by: dinosteven on November 27, 2012, 09:09:43 pm
1 Question: You can ask each of them "Where is the correct door?". It's not a tricky question, so you're safe.
2 of the guards will pick the same door. One guard will pick another door. The correct door is the one that 2 guards pointed to because there are 2 truthtellers.
Title: Re: You think you know this riddle...
Post by: Builderboy on November 27, 2012, 09:10:19 pm
1 Question: You can ask each of them "Where is the correct door?". It's not a tricky question, so you're safe.
2 of the guards will pick the same door. One guard will pick another door. The correct door is the one that 2 guards pointed to because there are 2 truthtellers.
You can only ask 2 questions D:
Title: Re: You think you know this riddle...
Post by: pimathbrainiac on November 27, 2012, 09:11:30 pm
D: D: D: D: D: D: D: D: D: D: D: I am no longer making riddles up!
Title: Re: You think you know this riddle...
Post by: dinosteven on November 27, 2012, 09:22:35 pm
You can only ask 2 questions D:
You can only ask two questions but can ask them to each person once. What questions do you ask how would you ask them?
I thought it meant that you could only ask 2 questions, but you could ask each question to each of the guards. If you can only ask 2 questions, then it's a lot tougher.
Title: Re: You think you know this riddle...
Post by: Scipi on November 27, 2012, 09:23:45 pm
If the first guy you ask is a liar, he will say that yes, he will kill you if you ask him a tricky question (he will be lying).  But you will also get the same response if the first guard is the one who kills people.  If the answer is yes, all you know is that the guard you just talked to is not the guard who tells the truth (but doesn't kill people), you still don't know where the liar is or where the guy is that kills people

Actually, by asking that, you will end up with two yeses and a no. yes (Truth, I will kill you) and yes (Lie, I actually won't kill you), and then there must be a no (Truth, I won't kill you)

The one who says no is one of the two that tells the truth. Thus, ask him what the exit is.

Quote
You can only ask 2 questions

But you can ask them to each guard once :P

So that would actually work as well.
Title: Re: You think you know this riddle...
Post by: Ranman on November 27, 2012, 10:00:41 pm
Nice one...

I heard a similar one a long time ago... it goes like this:

You come to a fork in the road and you need to figure out which way to go. There are two talking birds are at the fork. One bird is a liar, one bird is not. You can only ask one question. What question do you ask?

Answer: If you were lying, which way should I go?
Title: Re: You think you know this riddle...
Post by: pimathbrainiac on November 27, 2012, 10:09:24 pm
Well, it's based on that one...
Title: Re: You think you know this riddle...
Post by: dinosteven on November 27, 2012, 11:16:54 pm
Answer: If you were lying, which way should I go?
Wait - then the liar would give you the right path because he's lying and the truth teller would give you the wrong path. That wouldn't get you anywhere.
Is there something I'm not getting?
Title: Re: You think you know this riddle...
Post by: Goplat on November 27, 2012, 11:31:02 pm
That solution seems rather ambiguous. I prefer "Where would the other bird tell me to go?" (and go the opposite way)
Title: Re: You think you know this riddle...
Post by: cooliojazz on November 28, 2012, 12:56:08 am
Ooh, let's make this more interesting! >=D

Okay, there are fours doors (to continue the trend ;P), one leads out, the other three are an endless bath in cherry-flavored flames.  You can ask a total of two questions to any of the four doors, they do not need to be to the same door, and they are NOT chrono-ambiguous, so one CAN depend on the answer of the other.  The doors will always answer with yes or no and the questions can be a maximum of eight words.  One door always lies, one always tells the truth, another tells the truth if it's a weekday (and you have ABSOLUTELY no idea what day it is you've been wandering in this labyrinth for so long) and the last tells the truth only if your question has an odd number of words.  WHAT WILL YOU ASK SO YOU DON'T BECOME A DELICIOUS CHERRY-FLAVORED ROAST?????
Title: Re: You think you know this riddle...
Post by: Scipi on November 28, 2012, 01:50:12 am
Questions I want to ask, but won't work
Spoiler For Spoiler:
Question 1: Is the door I will pick safe? [7]
Because you are smart enough to escape, you will eventually leave unharmed. Pick any door as it will be the correct one. Also, Quantum Suicide.

Question 2: This sentence is false. Is that true? [7]

Door will explode, revealing what is behind it. Again with another door. You now have a 50-50 chance.

Edit: 1111th post!
Title: Re: You think you know this riddle...
Post by: aeTIos on November 28, 2012, 06:43:57 am
Lol xD
Title: Re: You think you know this riddle...
Post by: phenomist on December 01, 2012, 12:23:53 am
4 doors: Well, at least nobody's going to kill you for asking tricky questions. So let's ask them.

1) (Are you lying on this question) XOR (Is the safe door either door 1 or 2)?
2) (Are you lying on this question) XOR (Is the safe door either door 1 or 3)?
Title: Re: You think you know this riddle...
Post by: Eiyeron on December 01, 2012, 12:55:43 am
(http://imgs.xkcd.com/comics/labyrinth_puzzle.png)