Liar Truthteller Brain Teaser
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How to get correct advice when you can only ask one question from either a liar or a truthteller (when you don't know who is what)
More free lessons at: http://www.khanacademy.org/video?v=69rDtSpshAw
More free lessons at: http://www.khanacademy.org/video?v=69rDtSpshAw
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