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Probability Question - Prove Formula

  1. Feb 4, 2013 #1
    1. The problem statement, all variables and given/known data

    Hi,

    Prove P(AUB|C) = P(A|C)+P(B|C)-P(A∩B|C)

    2. Relevant equations



    3. The attempt at a solution

    I start off from here

    [itex]P(AUB|C)=\frac{P(AUB)P(C|AUB)}{P(C)}[/itex]

    I don't know where to go from here. Thanks for any help that you can provide.
     
  2. jcsd
  3. Feb 4, 2013 #2
    I think I actually figured this one. I realize that A, B, C may not necessairly be independent and for whatever reason I thought they where so I wasn't getting the correct answer
     
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