Respuesta :
as far as I can tell is just a Permutation,
[tex]\bf _nP_r=\cfrac{n!}{(n-r)!}\qquad \qquad \qquad _6P_6=\cfrac{6!}{(6-6)!}[/tex]
[tex]\bf _nP_r=\cfrac{n!}{(n-r)!}\qquad \qquad \qquad _6P_6=\cfrac{6!}{(6-6)!}[/tex]