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Homework Help: [probability theory] simple question about conditional probability

  1. Dec 29, 2009 #1
    Hi all,

    I've got this very simple problem:

    I know it is an elementary problem, but I never really got into that bayes' theorem, which I need to use here, right? I would be grateful for simple and plain explanation.

    thanks for your time,
  2. jcsd
  3. Dec 29, 2009 #2
    Venn diagrams are a way easy method for visualizing Bayes' equations.
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