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In the diagram, $9$ edges of
the cube are visible.

How many edges of the cube are not visible?

Pick one

A $0$ B $1$ C $2$ D $3$ E $4$

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Official solution

Every cube has $12$ edges, and
so $12-9=3$ edges are not
visible.

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