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Combinări de n+2 luate câte n+1?

Răspuns :


(n+2)!/(n+1)!*(n+2-n-1)!=(n+2)!/(n+1)!=n+2
[tex] \frac{(n+2)!}{(n+1)!*1!} = \frac{n+1)!(n+2)}{n+1)!} =n+2[/tex]