Question: Ask Marilyn In a September 19 2010 article in Parade

Ask Marilyn In a September 19, 2010, article in Parade Magazine written to Ask Marilyn, Marilyn vos Savant was asked the following: Four identical sealed envelopes are on a table, one of which contains $100. You are to select one of the envelopes.
Then the game host discards two of the remaining three envelopes and informs you that they do not contain the $100. In addition, the host offers you the opportunity to switch envelopes. What should you do?
(a) Keep your envelope;
(b) Switch;
(c) It does not matter.

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