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9th Class Mathematics Probability Question Bank Probability

  • question_answer
    Find the probability that in a family of 3 children, there will be at least one boy.

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

    B)         \[\frac{1}{8}\]                  

    C)         \[\frac{3}{8}\]                                  

    D)         \[\frac{5}{8}\]

    Correct Answer: A

    Solution :

    \[S=\{BBB,BBG,BGG,GGG\}\] \[\Rightarrow \]\[n(S)=4\] \[E=\{BBB,BBG,BGG\}\] \[\Rightarrow \]\[n(E)=3\] \[\therefore \]  \[P(E)=\frac{n(E)}{n(S)}=\frac{3}{4}\]


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