IMO Shortlist 1981 problem 5
Dodao/la: arhiva2. travnja 2012.
A cube is assembled with
white cubes. The larger cube is then painted black on the outside and disassembled. A blind man reassembles it. What is the probability that the cube is now completely black on the outside? Give an approximation of the size of your answer.
Izvor: Međunarodna matematička olimpijada, shortlist 1981