Four identical sealed envelopes are on a table. One of them contains a $100 bill. You select an enveloped at random and hold it in your hand without opening it. Two of the three remaining envelopes are then removed and set aside, unopened. You are told that they are empty. You are given the choice of keeping the envelope you chose or exchanging it for the one on the table. What should you do? A) Keep your envelope. B) Switch it. C) It doesn't matter.
-From Ask Marilyn
Answer is here: http://www.parade.com/askmarilyn/2010/09/Sundays-Column-09-19-10.html
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