IMO Shortlist 1972 problem 7
Dodao/la:
arhiva2. travnja 2012. Given four distinct parallel planes, prove that there exists a regular tetrahedron with a vertex on each plane.
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Given four distinct parallel planes, prove that there exists a regular tetrahedron with a vertex on each plane.
Izvor: Međunarodna matematička olimpijada, shortlist 1972
Školjka 
