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, 2007

Number theory Difficulty 2.0 Junior Find the answer Canada

What is the largest amount of postage in cents that cannot be made using only 3 cent and 5 cent stamps?

(A) $7$ (B) $13$ (C) $4$ (D) $8$ (E) $9$

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.