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Math Help - [SOLVED] Finding P(AandB)= and P(A)=

  1. #1
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    [SOLVED] Finding P(AandB)= and P(A)=

    The textbook mentions things such as "events are independent" "mutually exclusive" and "any events," which confuses me..

    So I was just wondering which formula i'm supposed to use for this question, and how we come to conclude that this is the formula we use for the given situation:

    Forumlas for finding P(A and B)= :
    1) P(AandB)= P(A) * P(B)
    2) P(AandB)= P(A) * P(B|A)

    Problem:
    P(A) = 0.61
    P(B) = 0.39
    P(A U B) = 0.75
    P(AandB) = ?


    and for another problem, I have to find P(A) and P(B), but i'm not sure how to find this. the only guess I can make is to work backwards, but i'm not so sure how to do that.
    Last edited by fb280; March 2nd 2010 at 10:16 AM.
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  2. #2
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    ok i've found out how to solve these types of problems.
    Last edited by fb280; March 2nd 2010 at 02:08 PM.
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