JEE Main & Advanced AIEEE Solved Paper-2013

  • question_answer
    A multiple choice examination has 5 questions. Each question has three alternative answers of which exactly one is correct. The probability that a student will get 4 or more correct answers just by guessing is:     AIEEE Solevd Paper-2013

    A) \[\frac{17}{{{3}^{5}}}\]                                 

    B) \[\frac{13}{{{3}^{5}}}\]                 

    C)        \[\frac{11}{{{3}^{5}}}\]                 

    D)        \[\frac{10}{{{3}^{5}}}\]

    Correct Answer: C

    Solution :

    Total No. of ways of attempting the question \[={{3}^{5}}\] \[5{{C}_{4}}{{\left( \frac{1}{3} \right)}^{4}}\left( \frac{2}{3} \right)+5{{C}_{5}}{{\left( \frac{1}{3} \right)}^{5}}\Rightarrow \frac{11}{{{3}^{5}}}\]


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