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A factory produces phones and it is known that the percentage of the produced phones that are defective is 25%. In a random sample of

  1. A factory produces phones and it is known that the percentage of the produced phones that are defective is 25%. In a random sample of 3 phones, what is the probability that:
  2. zero phones are defective

  1. one phone is defective

  1. at most one phone defective?

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