# Digits

• Mar 23rd 2010, 04:17 AM
sri340
Digits
It takes 852 digits to number the pages of a book consecutively.
How many pages are there? How many times is the digit 7 printed?

• Mar 23rd 2010, 05:02 AM
bobisback
Quote:

Originally Posted by sri340
It takes 852 digits to number the pages of a book consecutively.
How many pages are there? How many times is the digit 7 printed?

852 -9 (1-9) - 180 (10-99) = 663

then divide 663 by 3 = 223

And 7 appears once per 10 except at 70-79 where it appears 11 times over 10 pages so i get 62 u need 2 check my answers though make sure that i am right

bobisback
• Mar 23rd 2010, 05:11 AM
sa-ri-ga-ma
Quote:

Originally Posted by sri340
It takes 852 digits to number the pages of a book consecutively.
How many pages are there? How many times is the digit 7 printed?

Single digit...> 9 pages........9 digits
Two digits....> 90 pages.....> 180 digits
remaining digits .......(852 - 189) = 663 digits.
So the number of pages containing three digits is .........?