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x variacion... V n!= n!/ n-k!
x Combinacion .....C n!= (n!/n-k!).k!
x permutacion.....P n!= n!
este ejercicio es X combinatoria
n!= 8
k=6
C n!= n!/(n-k!).k!
C n! = (8). (7).(6!) / (8-6!).(6!)
C n! = (8). (7).(6!) / (2!). (6!)
C n! = 8.7 / (2).(1)
C n! =56 / 2
C n! = 28