Inner Cube Unaffected

Discrete Mathematics Level 2

On a 3×3×33\times3\times3 cube, all but one 1×1×11\times1\times1 are visible.

How many 1×1×11\times1\times1 cubes are visible on the surface of a 10×10×1010\times10\times10 cube?

Image Credit: Wikimedia Dhrm77.
David Pilling by David Pilling
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