IMO Shortlist 1983 problem 13
Kvaliteta:
Avg: 0,0Težina:
Avg: 0,0 Let be the set of points of the space all three of whose coordinates are integers between and (including and ). A coloring of is a map from to the set {red, blue}. How many colorings of are there satisfying the following property: The number of red vertices among the vertices of any right-angled parallelepiped is a multiple of ?
Izvor: Međunarodna matematička olimpijada, shortlist 1983