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JEE Main & Advanced Mathematics Probability Question Bank Definition of probability

  • question_answer
    The probability of happening an event A in one trial is 0.4. The probability that  the event A happens at least once in three independent trials is [IIT 1980; Kurukshetra CEE 1998; DCE 2001]

    A)                 0.936     

    B)                 0.784

    C)                 0.904     

    D)                 0.216

    Correct Answer: B

    Solution :

               Here \[P(A)=0.4\] and \[P(\bar{A})=0.6\]            Probability that \[A\] does not happen at all \[={{(0.6)}^{3}}\]                 Thus required Probability \[=1-{{(0.6)}^{3}}=0.784\].


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