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      Question

      In a container, there are (x + 4) red balls, β€˜x’

      blue balls, and (x + 5) black balls. If the probability of picking two blue balls at random is (1/30), then find the value of β€˜x’.
      A 10 Correct Answer Incorrect Answer
      B 12 Correct Answer Incorrect Answer
      C 6 Correct Answer Incorrect Answer
      D 15 Correct Answer Incorrect Answer

      Solution

      According to the question, Total number of balls in the container = (x + 4 + x + x + 5) = (3x + 9) According to the question, Since the number of balls cannot be negative, Therefore, x = 6

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