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 Subject: riddle Category: Miscellaneous Asked by: macdonald-ga List Price: \$50.00 Posted: 10 Oct 2006 09:54 PDT Expires: 09 Nov 2006 08:54 PST Question ID: 772308
 ```Imagine, if you will, that you needed the bird flu vaccine and time is running out. Before you are 2 Medical Administrators and 2 doors. One MA is standing in front of each door. But what's behind the door, you ask. Well, in the room behind one of the doors is the bird flu vaccine and in the room behind the other door is nothing. You do not know which door leads to which room, and that's where the MAs come in. The 2 MAs know which room has the vaccine, but the only problem is that one MA always tells the truth and the other MA always tells a lie. And added to that, you do not know which MA is which. They look the same. Here's your task: You can only ask one MA one question and your goal is to get into that room with the vaccine, because as it was previously mentioned, time is running out. What is the one question you ask the one MA to guarantee that you access the right room and save yourself? Hurry, time is running out.```
 Subject: Re: riddle Answered By: bobbie7-ga on 10 Oct 2006 10:22 PDT
 ```Hello Macdonald, The question would be: "What door would the OTHER Medical Administrators tell me to go through?" (Listen to his answer, and then walk through the opposite door!) Explanation: The Medical Administrators that always lies would lie, by saying something like.... "That other MA will tell you to go through this door" (Which is a lie in itself, remember- He ALWAYS LIES & can NEVER tell the truth) Therefore, your recourse should be the wise move by going through the OTHER door. And likewise, the Medical Administrators that always tells the truth would tell the truth, looking toward his counterpart and saying.... " Him? Why he would tell you to go through this door!" Read more about this kind of logic problem here: Ask Dr Math - Liars & Truthtellers http://mathforum.org/dr.math/faq/faq.liar.html Other similar riddles: http://www.sciam.com/article.cfm?articleID=000CC9E5-AE4C-11FF-A87E83414B7F0000 http://www.cut-the-knot.org/impossible/brothers.shtml http://www.math.sunysb.edu/posterproject/www/materials/ask-right-question/ask-right-question.html Search terms: ?always tells the truth? I hope the information provided is helpful! Best regards, Bobbie7``` Clarification of Answer by bobbie7-ga on 10 Oct 2006 10:24 PDT ```Please excuse my typo. It should be "Medical Administrator" and not "Medical AdministratorS"```
 Subject: Re: riddle From: steph53-ga on 10 Oct 2006 11:34 PDT
 ```Has anyone else noticed that this was a duplicate question and therefore answered twice now??? Steph53```
 Subject: Re: riddle From: bobbie7-ga on 10 Oct 2006 11:48 PDT
 ```Hi Steph53, When I first locked this question I did not see a duplicate question. After I posted my answer to this question, I noticed it. Unfotunatley, it was already locked by another researcher so I was not able to post a warning.```
 Subject: Re: riddle From: bobbie7-ga on 10 Oct 2006 11:49 PDT
 `It should be "Unfortunately"`
 Subject: Re: riddle From: probonopublico-ga on 10 Oct 2006 11:59 PDT
 `Luckily both answers were the same!`
 Subject: Re: riddle From: rainbow-ga on 10 Oct 2006 12:18 PDT
 `Same as Bobbie. I didn't notice it either til after I answered it.`