Counting Strategy

China 1999, by Zhusheng Zhang

A 4 × 4 × 4 4×4×4 cube is composed of 64 64 unit cubes. The faces of 16 16 unit cubes are to be colored red. A coloring is called interesting if there is exactly 1 1 red unit cube in every 1 × 1 × 4 1 × 1 × 4 rectangular box composed of 4 4 unit cubes. Determine the number of interesting colorings. (Two colorings are different even if one can be transformed into another by a series of rotations.)


The answer is 576.

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