In the same 3×3×3 painted cube cut into 27 pieces, how many small cubes have exactly 3 faces painted?
- A.4
- B.6
- C.8 ✓
- D.12
Explanation: The corner cubes are the only ones touching 3 outer faces — a cube has 8 corners.
Class 6 IMO Mathematics Olympiad practice · Visual & Spatial Reasoning · Mirror Images, Folding & Cubes
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