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A coin is tossed thrice. Let X be the event that head occurs in each of the first two tosses. Let Y be the event that a tail occurs in the third toss. Let Z be the event that two tails occur in three tosses. Bases on the above information, which one of the following is TRUE?                                                                                  

      (a) X and Y are not independent

      (b) Y and Z are dependent

      (c) Y and Z are independent

      (d) X and Z are independent

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