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9th Class Mathematics Probability Question Bank Probability

  • question_answer
    In a box, there are 8 red, 7 blue and 6 green balls. One ball is picked up randomly. What is the probability that it is neither red nor green?

    A) \[\frac{2}{3}\]                       

    B)        \[\frac{3}{4}\]

    C) \[\frac{7}{19}\]                     

    D)        \[\frac{8}{21}\]

    E) None of these

    Correct Answer: D

    Solution :

    Explanation Option [d] is correct. Total number of balls \[=\text{ }\left( 8+7+6 \right)\,\,=21\] Let E = event that the ball drawn is neither red nor green = event that the ball drawn is red. \[\therefore n(\,E)=8\,\] \[\therefore n(\,E)=\frac{8\,}{21}\].


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