Jack is looking at Anne, but Anne is looking at George. Jack is married, but George is not. Is a married person looking at an unmarried person?
(a) Yes
(b) No
(c) Can not be determined
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Common answer is (c), and the right answer is (a). Here is why,
Anne is either married or unmarried. If she is unmarried then married Jack is looking at her, and if she is married then she is looking at unmarried George!
(HT: A Blank Slate via Steven Landsburg)
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