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Probability problem

  • Thread starter leright
  • Start date
  • #1
1,306
19
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?

Thanks.
 

Answers and Replies

  • #2
695
0
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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