Bonjour,

Voici un petit exercice / Chapitre : "Dénombrement"


Soit [tex]n \in \mathbb{N}[/tex] et [tex]n \geq 1[/tex]


Simplifier les nombres suivants :


[tex]a = \dfrac{(n+1)!}{2\times n !}[/tex]

[tex]b = \dfrac{(2n+1)!}{4n(2n-1)!}[/tex]

[tex]c = \dfrac{n!}{n}-(n-1)![/tex]
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