IMO Shortlist 1969 problem 39
Dodao/la:
arhiva2. travnja 2012. Find the positions of three points
on the boundary of a unit cube such that
is the greatest possible.
%V0
$(HUN 6)$ Find the positions of three points $A,B,C$ on the boundary of a unit cube such that $min\{AB,AC,BC\}$ is the greatest possible.
Izvor: Međunarodna matematička olimpijada, shortlist 1969