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CTK Exchange
Merrovingian
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Nov-26-04, 09:46 PM (EST) |
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"Response to Stephan Hradek riddle"
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It went like this "Someone was sentenced to death, but since the king loves riddles, he threw this guy into a room with two doors. One leading to death, one leading to freedom. There are two soldiers, each one guarding one door. One of the guards is a perfect liar, the other one will always tell the truth. The man is allowed to ask one soldier one yes-no question and then has to decide, which door to take. Which one question can he ask to find the door to freedom?". My answer or question would be to ask any one guard "If I were to ask the other guard if this door led to freedom, would he say yes?" while pointing either of the 2 doors. Explanation: It does not matter who you ask both of their answers are the same. A reply of yes pointing to one door means that door leads to death, while a reply of no pointing at the same door means that door leads to freedom. I had to put this in symbolic logic form to see the answer. My name is Kush Scott. This was a good riddle. |
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Bob S
Member since Nov-13-04
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Nov-27-04, 01:00 AM (EST) |
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1. "One question to one guard."
In response to message #0
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Your solution requires one question to each guard. >My answer or question would be to ask any one guard "If I
>were to ask the other guard if this door led to freedom,
>would he say yes?" while pointing either of the 2 doors. >Explanation: It does not matter who you ask >both< of their answers are the same. A >reply of yes pointing to one door means that door leads to death, while a reply of no >pointing at the same door means that door leads to freedom. Just ask one guard one question to which the answer is obvious, such as; do you have three eyes? Their honesty, or lack of will be apparent. The problem is, which guard is at which door? you don't say and I have not seen the original riddle.
thebobguy
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rewboss
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Nov-28-04, 09:13 AM (EST) |
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2. "RE: One question to one guard."
In response to message #1
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I think, Bob S, that you have misunderstood the riddle. >Your solution requires one question to each guard. No, the solution requires one question to one guard; one question in total. >Just ask one guard one question to which the answer is
>obvious, such as; do you have three eyes? Their honesty, or
>lack of will be apparent.
>
>The problem is, which guard is at which door? you don't say
>and I have not seen the original riddle. The original riddle is exactly as stated: he is only allowed to ask one question, and he has no idea which door is which, or which guard is the liar. If he asks, "Do you have three eyes", he's used up his question and all he knows is which guard is the liar and which is the truthful one. That won't help him, unless the king has a change of heart and grants him one more question. The usual answer to this riddle is the one Merrovingian gave, but slightly simplified: pick a guard at random, and ask him, "If I ask your friend here to show me which door leads to life, which door would he indicate?" Then, whichever door he points to, pick the other. There are, basically, two possibilities. If the man picks the truthful guard, he (the guard) will think this way: "I know that door A leads to life. I also know that my colleague always lies. So, if the man asks him, he will inevitably point to door B. I always tell the truth, so I will point to door B, as that will be the truthful answer to the question." If the man picks the liar, he will reason this way: "I know that door A leads to life. My colleague also knows that door A leads to life. My colleague always tells the truth, so if the man asked him, he would truthfully point to A. I, however, am a pathalogical liar, so I will claim that my colleague would indicate door B." Note that, in real life, this question may not always have the desired result. If the answer comes back as "I don't know", you'll have to toss a coin after all. |
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Nick
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Nov-29-04, 10:14 PM (EST) |
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3. "RE: One question to one guard."
In response to message #2
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the question can only be answered with a "yes" or "no". Pointing is not an answer. Here is my original riddle Two Doors- One leads to captivity and the other leads to freedom, you dont know which. A guard stands in front of each door - one always lies and the other always tells the truth and you have no way of knowing who the liar is or who the truth-teller is. You may ask one guard one question, to which he can only answer "yes" or "no". Each guard knows who the other one is and which door is which. What is the question whos answer would absolutely direct you to the door of freedom? |
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td
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Jul-16-06, 08:59 PM (EST) |
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7. "a bit late, but his is the correct answer"
In response to message #6
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go up to both guards and ask "what would your friend say if asked which door leads to death?" both would point to life. note:
the liar would lie about what his friend would say. |
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selene
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Oct-28-06, 06:35 AM (EST) |
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8. "RE: One question to one guard."
In response to message #1
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just ask both, are you a guy... the one who is lying will say no, meaning they are saying they are a girl, which he's not, thus knowing who lies... |
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