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SSC Sample Paper SSC CGL - Sample Paper-6

  • question_answer
    A printer numbers the pages of a book starting with 1 and uses 3189 digits in all. How many pages does the book have?

    A)  1000               

    B)  1074

    C)  1075                           

    D)  1080

    Correct Answer: B

    Solution :

    Number of digits in 1-digit page numbers \[=1\times 9=9\] Number of digits in 2-digit page numbers \[=2\times 90=180\] Number of digits in 3-digit page numbers \[=3\times 900=2700\] Number of digits in 4-digit page numbers \[=3189-(9+180+2700)=3189-2889=300\] \[\therefore \] Number of pages with 4-digit page numbers \[=\left( \frac{300}{4} \right)=75\] Hence, total number of pages \[=(999+75)=1074\]


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