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10th Class Mathematics Probability Question Bank Probability

  • question_answer
    A box contains 60 pens which are blue-inked or black-inked. If a pen is picked at random, the probability of picking a blue-inked pen is \[\frac{2}{5}\], what is the number of blue-inked pens in the box?

    A)  32                               

    B)  48        

    C)  30                               

    D)  24

    Correct Answer: D

    Solution :

    (d): Let BLUE pens be ?a? P (blue) \[=\frac{a}{60}=\frac{2}{5}\Rightarrow a=24\]


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