For a 5 cm cube sliced into unit cubes: 8 corner cubes have three faces painted, 12 × 3 = 36 edge cubes have two, 6 × 9 = 54 face-center cubes have one and 3³ = 27 interior cubes ...
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For a 5 cm cube sliced into unit cubes: 8 corner cubes have three faces painted, 12 × 3 = 36 edge cubes have two, 6 × 9 = 54 face-center cubes have one and 3³ = 27 interior cubes ...