IMO Shortlist 1983 problem 13
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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
?
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
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