TOT 188 1988 Autumn J1 , -1 or 1 on eeach vertex of cube, sum of 14 numbers=0
Source:
May 20, 2020
combinatoricscube
Problem Statement
One of the numbers or is assigned to each vertex of a cube. To each face of the cube is assigned the integer which is the product of the four integers at the vertices of the face. Is it possible that the sum of the assigned integers is ? (G. Galperin)