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Only the top face of this cube is painted red. It is then cut along the lines. How many small cubes have no paint?

Competition practiceDice & Cubes
  • A9
  • B18
  • C27
  • D8

Step-by-Step Solution

Only the top layer touches the paint, and it holds cubes. The other two layers, cubes, have no paint. (9 is the number of painted cubes.)
Answer: B) 18

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