Este audio es sobre el origen del himno nacional.
La curva de frecuencia en este ejercicio es simétrica o en forma de campana.
DESARROLLO:
1) S= { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 }
2) R= { 2, 4, 6, 10, 14, 15, 20 }
W= { 1, 2, 3, 4, 8, 12, 13, 20 }
X= { 1, 2, 5, 6, 7, 8, 20 }
3) W U R= { 1, 2, 3, 4, 6, 8, 10, 12, 13, 14, 15, 20 }
W U X= { 1, 2, 3, 4, 5, 6, 7, 8, 12, 13, 20 }
4) W= { 5, 6, 7, 9, 10, 11, 14, 15, 16, 17, 18, 19 }
R= { 1, 3, 5, 7, 8, 9, 11, 12, 13, 16, 17, 18, 19 }
X= { 3, 4, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 }
5) R Ω X= { 2, 6, 20 }
6) W Ω R= { 2, 4, 20 }