113.Painting a 4x4x4 Cube
★★★combinatoricsJane Street
A 4x4x4 cube is painted on all six outer faces and then cut into 64 unit cubes. How many of them have paint on at least one face?
Sign in to submit an answer and track it toward your stats.
Sign inHint
The unpainted pieces form a smaller solid block in the middle.
Want timed drills, mental math, and a market-making game too? Try the full practice suite →