00:01
All right.
00:01
So here we have a little bit of a conceptual problem.
00:04
I drew it out and we're going to do this visually because it being conceptual, it can really, you know, feel a little confusing.
00:14
So we have a 5x5 cube that's composed of smaller one -by -one cubes.
00:20
So basically we have five, the basically the big cube is composed of one -by -one cubes.
00:33
And there would be five, therefore there would be five small cubes by five small cubes by five small cubes.
00:39
If you paint the entire surface, how many smaller one by one by one cubes would have exactly two faces painted? so let's just go ahead and do this.
00:51
So first of all, i drew three of the surfaces of this cube.
00:57
A cube has eight equal surfaces.
01:01
Therefore, we're going to do our stuff on these three and ignore the other three for one important reason.
01:07
And it's that these one -by -one cubes actually share surfaces.
01:14
So i'm just going to go and do it like this.
01:19
This cube right here has sides on both this surface and this surface.
01:26
And this one right here has it actually on all three.
01:33
But we'll do it to that...