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Statement of a problem № m661

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A lot of 100 semiconductor chips contains 20 that are defective. (a) Two are selected, at random, without replacement, from the lot. Determine the probability that the second chip selected is defective. (b) Three are selected, at random, without replacement, from the lot. Determine the probability that all are defective.

Solution:
A lot of 100 semiconductor chips contains 20 that are defective.
  (a) Two are

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