In order to unlock the Sierpinski carpet problem, it is very important to define the area that is being taken away. There are two key elements of the area that is removed, the number of the area and the length of the area. If the area that is removed is found, it is easy to find the rest the area, which is basically just one minus the removed area. The last part of the problem requires looking back at the setting of the algorithm, which already gives the answer away.