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10th Class Mathematics Probability Question Bank Probability

  • question_answer
    A box contains 20 balls bearing numbers 1,2,3,...,20.A ball is drawn at random from the box. What is the probability that the number on the balls is not divisible by 10?

    A)  \[\frac{9}{10}\]                               

    B)  \[\frac{1}{10}\]

    C)  \[\frac{9}{5}\]                  

    D)         \[\frac{1}{5}\]

    Correct Answer: A

    Solution :

     Numbers divisible by 10 from 1 to 20 are 10 and 20 i.e., 18 numbers are not divisible by 10. \[\therefore \]\[P(A)=\frac{n(A)}{n(S)}=\frac{18}{20}=\frac{9}{10}\]


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