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10th Class Mathematics Probability Question Bank MCQs - Probability

  • question_answer
    A bag contains 5 red balls and some blue balls. If the probability of drawings a blue ball is double that of a red ball, the number of blue balls in the bag is 10.

    A) True

    B) False

    C) Can't say

    D) Partially true/False

    Correct Answer: A

    Solution :

    Number of red balls = 5 Let the number of blue balls in the bag = x \[\therefore \]Total number of balls = x + 5 \[\therefore \]Probability of red ball \[=\frac{5}{5+x}\] and probability (blue balls) \[=\frac{x}{5+x}\] According to question, \[\frac{x}{5+x}=2\times \frac{5}{5+x}\] x = 10


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