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Thread: (> one hour invested)

  1. #1
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    (> one hour invested)




    I have spent more time than I should this one.
    Given that P(A or B) = 1/4, P(A) = 1/7, and P(A and B) = 1/9, find P(B).

    I've worked it many ways and I can't seem to come up with a logical answer.

  2. #2
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    Re: (> one hour invested)


    Inclusion-Exclusion Principle. Draw a Venn Diagram if that helps you to understand better.

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