Problem #PRU-110083

Problemas Matemáticas Discretas Combinatoria Problemas de pintura Métodos Principio del casillero Principio del casillero (número finito de puntos, líneas, etc.) Problemas divertidos Problemas de palabras Tablas y torneos Tablas y torneos (otros)
 12–14  3.0

Problem

Can the cells of a \(5 \times 5\) board be painted in 4 colours so that the cells located at the intersection of any two rows and any two columns are painted in at least three colours?