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