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Math Help - Probability logic

  1. #1
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    Probability logic

    Hi. Can someone help me out. i'm looking a how a problem was solved and can't figure out why (or how) the solution got from point a--b

    basically, it states 1- p(C' ^ T') = p(C v T)

    this may be basic logic in probability but i'm lost... how does the probability of C' and T' equal the probabilty of C or T?

    the next step just uses the general addition rule: p(C v T) = p(C) + p(T) - p(C ^ T) which i understand completely, just having trouble w/ the first part. can someone help me out please and what rule is that???
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  2. #2
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    Quote Originally Posted by uneakbreed View Post
    ...

    basically, it states 1- p(C' ^ T') = p(C v T)...

    ...how does the probability of C' and T' equal the probabilty of C or T?
    It's a simple application of De Morgan's laws. Draw Venn diagrams to help visualise it
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