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Homework Help: 2D probability integral question

  1. Feb 5, 2010 #1
    the question and solution
    after i they find the total interval of the total function
    i cant understand
    what they do with the graph and how they derive the integrals from it
  2. jcsd
  3. Feb 6, 2010 #2
    how to we know that x1x2<t is bellow this line
    how to we know that x1x2>t is above this line
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