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      Question

      If X and Y represent waiting time and service time of

      customers in shopping mall, have joint destiny f(x, y) = kx; 0 ≀ y ≀ x ≀ 1, then the value of k is
      A 3 Correct Answer Incorrect Answer
      B 1 Correct Answer Incorrect Answer
      C 4 Correct Answer Incorrect Answer
      D 2 Correct Answer Incorrect Answer

      Solution

      The correct answer is A

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