Problem #PRU-103780

Problemas Métodos Métodos algebraicos Particiones en pares y grupos; biyecciones Principio de la casilla Principio de la casilla (otro) Prueba por agotamiento
 11–13  3.0

Problem

In any group of 10 children, out of a total of 60 pupils, there will be three who are in the same class. Will it always be the case that amongst the 60 pupils there will be: 1) 15 classmates? 2) 16 classmates?