Emma counts the number of students in her class with each eye and hair colour, and summarizes the results in the following table:
Hair Colour: Brown, Blonde, Red
Eye Colour Blue: Brown 3, Blonde 2, Red 1 Eye Colour Green: Brown 2, Blonde 4, Red 2 Eye Colour Brown: Brown 2, Blonde 3, Red 1
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.