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Math Help - Probability_2

  1. #1
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    Question Probability_2

    Can anyone help me with this task, please ?
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  2. #2
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    Quote Originally Posted by kochwow View Post
    Can anyone help me with this task, please ?
    Those are completely straightforward problems.
    So where are you having difficulties?
    Do you know the rules and/or the definitions involved?
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  3. #3
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    Quote Originally Posted by Plato View Post
    Those are completely straightforward problems.
    So where are you having difficulties?
    Do you know the rules and/or the definitions involved?
    I'm sure that for you they are completely straightforward and you do not have any problems with solving them. However, I posted it, simply because I don't understand it at all. What would be the point of posting thread which I can solve?
    I don't know the rules, probability it's just one of those things that don't come into my head and I can't understand them...

    I'm sorry if I've disappointed you by NOT KNOWING the answer for this completly straightforward problem.
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  4. #4
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    O.K. then reply to this question. The answer is in your textbook.
    You tell us what are the correct formulas (rules) for  P(A|B) = ?\;\& \;P(A \cup B) = ?

    I will give you some hints on part c).
    \left( {A^c  \cap B^c } \right) = \left( {A \cup B} \right)^c \; \Rightarrow \;P\left( {A^c  \cap B^c } \right) = 1 - P\left( {A \cup B} \right).
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