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Thread: Face down paper strategy

  1. #1
    Sep 2012

    Face down paper strategy

    Three pieces of paper each have one random number written on them. They are
    placed upside down on a table. The objective is to choose the slip with the
    highest number on it.
    The rules are: You may turn over any one of the three papers and look at its
    number. If you think it is the highest, then keep that paper and stop. Otherwise,
    discard that paper and choose a second one. You may then either keep the second
    one or discard it and take the last paper, in which case you must keep that one.
    1. Is there any strategy you may use to increase your chances of winning, or will
    it make no difference how you play the game?
    2. If there is a superior strategy, describe it. If there is none, then explain why.
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  2. #2
    MHF Contributor
    Sep 2012

    Re: Face down paper strategy

    Hey testtrail429.

    Try building a probability tree for your events and see if particular branches have an advantage over other branches.
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