How many pieces have exactly one color on them?
Explanation:
Number of cubes with exactly 1 color on them will be from middle of the faces.
There are 2 faces each with 4 × 5 = 20 cubes, 4 × 3 = 12 cubes and 3 × 5 = 15 cubes.
∴ Total such cubes = 2 × (20 + 12 + 15) = 94.
Hence, 94.
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