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Urgent help please- conditional probability

  • Thread starter Thread starter Nikita90
  • Start date Start date
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Nikita90

Member
Hi everyone.

Ive had a major block and have completely forgotton all understanding around conditional probability and theres only a day left before the exam. Im desperately trying to get some understanding back. Im looking at question 4 on september 2017 paper and i just cannot do oart 2 onwards.
My initial problem is that I cant decide when i should be using which formula...

P(Ae|Do)= p(Ae).p(Do|Ae) or

P(Ae|Do)= p(Ae n Do)/ p(Do)

Any advise or tips on understading this would be really appreciated as its quite a common topic.

Thank you in advance
 
Personally I would stuff the whole conditional worries and draw a tree diagram.
It's much much easier to work from this.
 
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