Problem #PRU-100219

Problemas Teoría de Números Divisibilidad Reglas de Divisibilidad Pruebas de Divisibilidad (otras)

Problem

When Robinson Crusoe and his friend Friday learned about divisibility rules, Friday decided to proposed his own rule:

if a number is divisible by \(27\), then the sum of its digits is also divisible by \(27\).

Was Friday right?