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12-37.
  1. Three light bulbs are chosen at random from 15 bulbs, of which five are defective. What is the probability that:

    1. None of the three are defective. Homework Help ✎

    2. Exactly two are defective.

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

Use the same method as part (a).