How many small cubes in the same 3×3×3 cube have no painted faces at all?
- A.0
- B.1 ✓
- C.2
- D.4
Explanation: Only the single cube at the very centre (1×1×1 core) touches none of the outer faces.
Class 6 IMO Mathematics Olympiad practice · Visual & Spatial Reasoning · Mirror Images, Folding & Cubes
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