Question

What is the total number of digits required in numbering the pages of a book, which has 1,724 pages?

Answer 1

5789

Explanation:

n-m = m-n+1

1-9 = 9 digits

10-99 = 180 digits

100-999 = 2700 digits

1000-1724 = 2900 digits

Add them all together and get 5789.