- $u_n = \frac{1}{n} \sqrt[n]{\prod_{k=1}^n (n+k)}$
- $u_n = \left[ \prod_{k=1}^n \left(1+\frac{k}{n}\right)^k\right]^{\frac{1}{n^2}}$
Calculer $\lim_{n \to +\infty} u_n$ dans chacun des cas suivants :
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