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12-37.

   Three light bulbs are chosen at random from bulbs, of which five are defective. What is the probability that: Homework Help ✎

  1. None of the three are defective.

    Use combinations to solve this problem. For a review of combinations, see the Math Notes in Lesson 10.1.1.

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  2. Exactly two are defective.

    Use the same method as part (a).