Maths Olympiad Prep

Track / Stage 1 / 6 of 320 #6 of 2604

Problem 6

Number theory Difficulty 1.0 Find the answer CEMC Gauss (Grade 8) · Canada · 2005

How many integers between 11 and 6060 contain the digit 33 at least once?

(A) 66 (B) 1010 (C) 1414 (D) 1515 (E) 2020

The source for this one didn't record the answer, so there is nothing to check what you type against. Work it on paper and mark yourself against the solution below.

Next problem →

We don't reproduce this publisher's solutions. Their own solution is here — work the problem first.

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