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probability

/in /by

A coin is tossed n times.

  1. a) What is the total number of ways the n tosses could come out?
  2. b) What is the number of ways the n tosses could come out so that there are exactly k heads among them? Here k is an integer in the range 0 < k < n. Check that your answer makes sense for the boundary cases k = 0 and k = n.
  3. c) What is the chance that there are exactly k heads among the n tosses?
 
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