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Conditional probability help

  1. Dec 7, 2007 #1
    conditional probability help plz

    1. The problem statement, all variables and given/known data
    Hi there,
    I am doing s1 for this jan and i am finding it very difficult to cope up. Especially for probability. I have a cgp buk but stil its not very gud at probability. Here is a question from my text buk which i cud not understand : -

    Two events A and B are such that P(A) = 3/4 , P(B l A) = 1/5 and P(B' l A') = 4/7. By use of a probability tree or other wise find :

    a) P(A and B)

    b) P(B)

    c) P(A l B)

    In addition, can some 1 suggest a gud buk for probability plz.

    2. Relevant equations

    P(B l A) = P(A intersection B) / P(A)

    3. The attempt at a solution

    I got 'a' right by multiplying 3/4 by 1/5

    Plz reply
    Hasnain Mir Mohammed
  2. jcsd
  3. Dec 7, 2007 #2
    i hav worked it out now...thanks.
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