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MathNet 2024-part-06 — 165 problems (EN–VI) Question 77

Math Olympiad Vault · MathNet 2024-part-06 — 165 problems (EN–VI)

Question 77

Compute the number of ways there are to assemble 2 red unit cubes and 25 white unit cubes into a $3 \times 3 \times 3$ cube such that red is visible on exactly 4 faces of the larger cube. (Rotations and reflections are considered distinct.)