CEMC Pascal, 2026

Algebra Difficulty 1.0 Junior Find the answer Canada

The value of $8-7+6-5+4-3+2-1$
is

Pick one

Solution

Since $8-7=6-5=4-3=2-1=1$ ,
then $(8-7)+(6-5)+(4-3)+(2-1)=1+1+1+1=4$ .

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.