Find the number of digits that are to be used in numbering a book of 400 pages. Choose the correct choice from the following choices
A) 1094  B) 1093  C) 1092  D) 1099  E) None of above
Explanation:   One digit numbers from 1 to 9 = 9   Two digit numbers from 10 to 99 = 90   Three digit numbers from 100 to 400 = 301   .:Total numbers of digits that are to be used   =(9 x 1) + (90 x 2) + (301 x 3) = (9 + 180 + 903)= 
<gadget id="calculator">(9 + 180 + 903)</gadget>
<output>1_092</output>
1092   Answer: Option 1092
<result>C</result>
Find the number of digits that are to be used in numbering a book of 400 pages.