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, 2003

Algebra Difficulty 1.0 Junior Find the answer Canada

The value of $1+2+3-4+5+6+7-8+9+10+11-12$ is

(A) $30$ (B) $42$ (C) $54$ (D) $65$ (E) $78$

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.