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Meaning of prime re: event

  1. Aug 4, 2008 #1
    I have run into a use of the symbol usually called prime (y' for example) in the description of an event.

    P(A or B')

    Please, what does it mean?
  2. jcsd
  3. Aug 4, 2008 #2
    I think some old texts use it as complement.
  4. Aug 4, 2008 #3
    Thanks, that makes sense with the rest of the problem.
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