Maths Olympiad Prep

Library / CEMC Cayley /245 of 470

CEMC Cayley, 2009

Number theory Difficulty 2.0 Junior Find the answer Canada

How many integers nn are there with the property that the product of the digits of nn is 0, where 5000≤n≤60005000 \le n \le 6000?

(A) 332332 (B) 270270 (C) 301301 (D) 272272 (E) 299299

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