Question

You have a 10 x 10 x 10 inch cube that is made up of little 1 x 1 x 1 inch cubes. You paint the outside of the big cube red. How many of the little cubes have paint on at least one of their sides?

Answer 1

@ranga @Mertsj @phi

Answer 2

First do the cubes on the edges and be careful not to count them twice.

Answer 3

What do you mean by that?