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Math Help - stats probability/compliments

  1. #1
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    stats probability/compliments

    find P(A intersection B) for each

    p(A)=.25 p(b)=.32 and p(a U b)=.50


    i think the formula has multiplying not sure tho


    P (probability)
    P of the compliment of A= .27 and P of the compliment of b=.19 and
    the P(A U B) =.9
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  2. #2
    o_O
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    #1: Directly apply the formula:
    P(A \cup B) = P(A) + P(B) - P(A \cap B)
    \Rightarrow P(A \cap B) =  P(A) + P(B) - P(A \cup B)

    #2: P(A \cap B) = P(A) + P(B) - P(A \cup B) = (1 - P(A')) + (1 - P(B')) - P(A \cup B)
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