Maths Olympiad Prep

Library / /320 of 356

, 2008

Number theory Difficulty 3.0 AMC 10/12 Find the answer Canada

The sum of all the digits of the integers from 9898 to 101101 is
9+8+9+9+1+0+0+1+0+1=389 + 8 + 9 + 9 + 1 + 0 + 0 + 1 + 0 + 1 = 38
The sum of all of the digits of the integers from 11 to 20082008 is

(A) 3005430\,054 (B) 2701827\,018 (C) 2803628\,036 (D) 3003630\,036 (E) 2805428\,054

Want a route through all this instead of an archive? The track puts 2,604 problems in a working order, from Junior Challenge level to the IMO shortlist.

Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.