To write all the page numbers of a book, exactly 136 times digit 1 has been used. Find the number of pages in the book.
Options:
A . 190
B . 195
C . 210
D . 220
Answer: Option B From 1- 99 digit 1 is used 20 times. And From 100 - 199, 1 is used 120 times So, from 1 to 199, 1 is used, 20 + 120 = 140 times We need 136.So leave 199, 198, 197 and 196 Required pages = 195
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