Can anyone help me with this task, please ?

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- Mar 24th 2009, 01:43 PM #1

- Joined
- Mar 2009
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- 3

- Mar 24th 2009, 02:06 PM #2

- Mar 24th 2009, 02:22 PM #3

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- Mar 2009
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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.

- Mar 24th 2009, 02:26 PM #4
O.K. then reply to this question. The answer is in your textbook.

**You tell us what are the correct formulas (rules) for**$\displaystyle P(A|B) = ?\;\& \;P(A \cup B) = ? $

I will give you some hints on part c).

$\displaystyle \left( {A^c \cap B^c } \right) = \left( {A \cup B} \right)^c \; \Rightarrow \;P\left( {A^c \cap B^c } \right) = 1 - P\left( {A \cup B} \right)$.