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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2001

  • question_answer
    Three coins are tossed together, then the probability of getting atleast one tail is

    A)  \[\frac{1}{8}\]

    B)  \[\frac{7}{8}\]

    C)  \[\frac{1}{2}\]

    D)  \[\frac{3}{4}\]

    Correct Answer: B

    Solution :

     When three coins are tossed together, then sample T space \[(HHH),(HHT),(HTT),(HTH),\] \[(THH),(THT),(TTT),(TTH)\] \[\Rightarrow \] \[n(S)=8\] Number of ways to get atleast one tail \[=(HHT),(HTT),(TTT),(HTH),(THT),(THH),\]           \[(TTH)\] \[n(E)=7\] \[\therefore \] Probability, \[P(E)=\frac{n(E)}{n(S)}=\frac{7}{8}\]


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