Respuestas

2013-09-04T21:21:47+02:00
2013-09-04T23:43:22+02:00
Si no se pueden repetir los dígitos
5!/(5-3)! = 120/2! = 120/2 = 60

{3,4,5} {3,4,6} {3,4,7} {3,5,4} {3,5,6} {3,5,7} {3,6,4} {3,6,5} {3,6,7} {3,7,4} {3,7,5} {3,7,6} {4,3,5} {4,3,6} {4,3,7} {4,5,3} {4,5,6} {4,5,7} {4,6,3} {4,6,5} {4,6,7} {4,7,3} {4,7,5} {4,7,6} {5,3,4} {5,3,6} {5,3,7} {5,4,3} {5,4,6} {5,4,7} {5,6,3} {5,6,4} {5,6,7} {5,7,3} {5,7,4} {5,7,6} {6,3,4} {6,3,5} {6,3,7} {6,4,3} {6,4,5} {6,4,7} {6,5,3} {6,5,4} {6,5,7} {6,7,3} {6,7,4} {6,7,5} {7,3,4} {7,3,5} {7,3,6} {7,4,3} {7,4,5} {7,4,6} {7,5,3} {7,5,4} {7,5,6} {7,6,3} {7,6,4} {7,6,5} 

si se pueden repetir los dígitos

5³ = 125

{3,3,3} {3,3,4} {3,3,5} {3,3,6} {3,3,7} {3,4,3} {3,4,4} {3,4,5} {3,4,6} {3,4,7} {3,5,3} {3,5,4} {3,5,5} {3,5,6} {3,5,7} {3,6,3} {3,6,4} {3,6,5} {3,6,6} {3,6,7} {3,7,3} {3,7,4} {3,7,5} {3,7,6} {3,7,7} {4,3,3} {4,3,4} {4,3,5} {4,3,6} {4,3,7} {4,4,3} {4,4,4} {4,4,5} {4,4,6} {4,4,7} {4,5,3} {4,5,4} {4,5,5} {4,5,6} {4,5,7} {4,6,3} {4,6,4} {4,6,5} {4,6,6} {4,6,7} {4,7,3} {4,7,4} {4,7,5} {4,7,6} {4,7,7} {5,3,3} {5,3,4} {5,3,5} {5,3,6} {5,3,7} {5,4,3} {5,4,4} {5,4,5} {5,4,6} {5,4,7} {5,5,3} {5,5,4} {5,5,5} {5,5,6} {5,5,7} {5,6,3} {5,6,4} {5,6,5} {5,6,6} {5,6,7} {5,7,3} {5,7,4} {5,7,5} {5,7,6} {5,7,7} {6,3,3} {6,3,4} {6,3,5} {6,3,6} {6,3,7} {6,4,3} {6,4,4} {6,4,5} {6,4,6} {6,4,7} {6,5,3} {6,5,4} {6,5,5} {6,5,6} {6,5,7} {6,6,3} {6,6,4} {6,6,5} {6,6,6} {6,6,7} {6,7,3} {6,7,4} {6,7,5} {6,7,6} {6,7,7} {7,3,3} {7,3,4} {7,3,5} {7,3,6} {7,3,7} {7,4,3} {7,4,4} {7,4,5} {7,4,6} {7,4,7} {7,5,3} {7,5,4} {7,5,5} {7,5,6} {7,5,7} {7,6,3} {7,6,4} {7,6,5} {7,6,6} {7,6,7} {7,7,3} {7,7,4} {7,7,5} {7,7,6} {7,7,7}