Respuesta :

[tex]\bf _nP_r=\cfrac{n!}{(n-r)!} \\\\\\ swimming\impliedby \textit{has 8 characters, how many groups of 8?} \\\\\\ _8P_8=\cfrac{8!}{(8-8)!}\implies _8P_8=\cfrac{8!}{1}[/tex]

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