There is a hemisphere hollow from inside in which there is a cone inscribed whose base is the diameter of the hemisphere. If the radius of the hemisphere is 6 cm, then find the ratio of the volume of hemisphere and volume of the remaining part of hemisphere when cone is dug out from it.
1
3 : 2
2
2 : 3
3
2 : 1
4
4 : 3
5
1 : 2