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J & K CET Engineering J and K - CET Engineering Solved Paper-2008

  • question_answer
    The probability that number selected at random from the number 1, 2, 3, 4, 5, 6, 7, 8, ..., 100 is a prime, is

    A)  \[0.4\]           

    B)  \[0.25\]

    C)  \[0.45\]          

    D)  \[0.43\]

    Correct Answer: B

    Solution :

    Let E = event of getting prime numbers from 1 to 100 \[=\{2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,\] \[53,59,61,71,73,79,83,89,97\}\] \[\therefore \] \[|\,\,\,\,\,\,\,\,n(E)=25\] \[\therefore \]   Required probability \[=\frac{25}{100}=0.25\]


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