TOT 379 1993 Autumn O J1 numbers on sides and vertices of hexagon
Source:
June 12, 2024
combinatorics
Problem Statement
We are given a hexagon with a number written on each of its sides and vertices. Each number on a vertex is equal to the sum of the two numbers on neighbouring sides. Assume all numbers of the sides and one vertex number were erased. Is it possible to find out the number that had been erased from a vertex?(Folklore)