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    I'm stuck on question 2(b) of the January 2012 paper.
    I think I need to find 'P(A *intersect* B)' but I don't know how.
    The only thing I can think of to use is the addition rule, but I have 2 unknowns.
    Please help!


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    (Original post by neev94)
    I'm stuck on question 2(b) of the January 2012 paper.
    I think I need to find 'P(A *intersect* B)' but I don't know how.
    The only thing I can think of to use is the addition rule, but I have 2 unknowns.
    Please help!


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    P(A'nB) means B intersect not A, this means you need P(B)x3/4
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    I know, but that's part (c), I haven't even got that far yet
    These are what I know so far
    P(A)= 1/4
    P(A *union* B)= 2/3
    P(A' *intersect* B')= 1/3

    Part (b) is to find P(B), but I don't know how


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