9th Class Mathematics Probability Question Bank Probability

  • question_answer Three unbiased coins are tossed. What is the probability of getting at least 2 heads?

    A)  \[\frac{1}{4}\]                                     

    B)  \[\frac{1}{2}\]

    C)  \[\frac{1}{3}\]                         

    D)  \[\frac{1}{8}\]

    Correct Answer: B

    Solution :

    (b): Here \[S=\{TTT,TTH,THT,HTT,THH,HTH,HHT,HHH\}\] Let E = event of getting at least two heads = x\[\{THH,HTH,HHT,HHH\}.\] \[\therefore p(E)=\frac{n(E)}{n(S)}=\frac{4}{8}=\frac{1}{2}\]


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