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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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