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Problem 38

Number theory Difficulty 1.1 Multiple choice CEMC Pascal · Canada · 2024

In a certain year, July 1 was a Wednesday. In that year, July 17
was a

Pick one

Official solution

If a figure has a vertical line of symmetry, then when it is
reflected in (or folded along) this vertical line, the two halves of the
figure are identical to one another. Of the given shapes, such a
vertical line is only possible for (E).

Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty, ordering) added by this project.