Here is a pile of identical cubes stacked in a corner against two walls. How many of the cubes are not visible?
Solution
There are 20 cubes. The answer can be found in several interesting ways.
1090.61 – A Pile of Cubes
Here is a pile of identical cubes stacked in a corner against two walls. How many of the cubes are not visible?
There are 20 cubes. The answer can be found in several interesting ways.