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A man writes a letter on average 2 times a week. What is the probability that the man will not write any letters for 1

A man writes a letter on average 2 times a week.

  1. What is the probability that the man will not write any letters for 1 week?
  2. What is the probability that the man will not write any letters for 2 weeks?
  3. What is the probability that the man will write atleast 3 times within 5 days?

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