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10th Class Mathematics Probability Question Bank Probability

  • question_answer
    A box contains 32 coloured marbles. Eight of them are red marbles and the rest are either blue or green marbles. A marble is drawn at random. Calculate the probability of drawing a marble which is not red in colour.

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

    B)  \[\frac{5}{8}\]

    C)  \[\frac{3}{4}\]                                  

    D)  \[\frac{7}{16}\]

    Correct Answer: C

    Solution :

     \[n(S)=32,n(R)=8\] \[p(R)=\frac{8}{32}=\frac{1}{4}\] \[\therefore \]The probability of drawing a marble which is not red in colour \[=1-\frac{1}{4}=\frac{3}{4}\]


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