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10th Class Mathematics Probability Question Bank MCQs - Probability

  • question_answer
    A bag contains 10 red flags and some green flags. If the probability of drawing a green flag is thrice that of drawing a red flag, then the number of green flags in the bag is:

    A) 10

    B) 20

    C) 30

    D) 3

    Correct Answer: C

    Solution :

    [c] Let the number of green flags be x. Then,
    \[3\left( \frac{10}{10+x} \right)=\frac{x}{10+x}\]
    \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x=30\]


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