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      Question

      A bag contains B red balls and 9

      purple balls. If two balls are drawn at random, one after the other without replacement, and the probability of drawing both red balls is 3/10, determine the value of B.
      A 6 Correct Answer Incorrect Answer
      B 7 Correct Answer Incorrect Answer
      C 8 Correct Answer Incorrect Answer
      D 9 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ, Using the optional method:

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