TOT 187 1988 Autumn Train J4 3 colours, 4 equal quartes of caces of cube
Source:
May 20, 2020
Coloringcombinatoricscubegeometry3D geometry
Problem Statement
Each face of a cube has been divided into four equal quarters and each quarter is painted with one of three available colours. Quarters with common sides are painted with different colours . Prove that each of the available colours was used in painting quarters.