A cube is painted on all faces and cut into 27 equal small cubes (3 x 3 x 3). How many small cubes have exactly two painted faces?
Answer and explanation
Correct answer: C. 12
- Step 1: Cubes with two painted faces lie on the edges but not at the corners. Step 2. The cube has 12 edges, each with one such cube. Answer: 12. Why not the others: 8 is the number of corner cubes, and 6 is the number with one painted face.
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