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10th Class Mathematics Probability Question Bank Probability

  • question_answer
    An urn contains 9 red balls and p green balls. If the probability of picking a red ball is thrice that of picking a green ball, then p is equal to _____.

    A)  6                                

    B)  7         

    C)  2                                

    D)  3

    Correct Answer: D

    Solution :

    (d): Probability of picking a red ball \[=\frac{9}{9+p}\] Probability of picking a green ball \[=\frac{p}{9+p}\] \[\therefore \]      \[=\frac{9}{9+p}=\frac{3p}{9+p}\] \[\Rightarrow \]   \[3p=9\Rightarrow p=3\].


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