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Homework Help: Probability problem

  1. Sep 18, 2005 #1
    Any help would be appreciated. I just want a push in the right direction...I am kinda struggling with these problems.

    A shipment of 12 TVs contains 3 defective sets. In how many ways can a hotel purchase 5 of these sets and recieve at least 2 of the defective sets?

  2. jcsd
  3. Sep 18, 2005 #2
    Count the number of sets which can be written like so:

    {all three defective TVs} [tex]\cup[/tex] {a set containing precisely two working TVs}, or

    {a set containing precisely two defective TVs} [tex]\cup[/tex] {a set containing precisely three working TVs}.
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