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A local TV company produced a batch of 100 TVs. Four of the TVs are defective. What is the probability a customer randomly selects three good TVs ?

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The number of TVs that are good in the batch $= 100 - 4 = 96.$
Since the number of TVs to choose from changes every time a TV is selected, the events are dependent.
P (customer chooses 3 good TVs) $ = \large\frac{96}{100} \normalsize \times \large\frac{95}{99} \normalsize \times \large\frac{94}{98}$$ = 0.8836$
answered Apr 2, 2014 by balaji.thirumalai

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