Question 6 Let (.) be a sequence of positive numbers with lim = L. Let 0

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### Advanced Calculus Exercises

#### Question 6

Let \((x_n)\) be a sequence of positive numbers with
\[
\lim_{n \to \infty} \frac{x_{n+1}}{x_n} = L.
\]

Let \(0 < \varepsilon < L\). Show that there exists \(K \in \mathbb{N}\) such that
\[
n \ge K \Rightarrow A(L - \varepsilon)^n \le x_n \le B(L + \varepsilon)^n.
\]

Deduce that
\[
\lim_{n \to \infty} x_n^{1/n} = L.
\]

#### Question 7

Assume the limit
\[
\lim_{n \to \infty} \left( 1 + \frac{1}{n} \right)^n = e.
\]

Use the previous exercise to show that
\[
\lim_{n \to \infty} \frac{n}{(n!)^{1/n}} = e.
\]
Transcribed Image Text:### Advanced Calculus Exercises #### Question 6 Let \((x_n)\) be a sequence of positive numbers with \[ \lim_{n \to \infty} \frac{x_{n+1}}{x_n} = L. \] Let \(0 < \varepsilon < L\). Show that there exists \(K \in \mathbb{N}\) such that \[ n \ge K \Rightarrow A(L - \varepsilon)^n \le x_n \le B(L + \varepsilon)^n. \] Deduce that \[ \lim_{n \to \infty} x_n^{1/n} = L. \] #### Question 7 Assume the limit \[ \lim_{n \to \infty} \left( 1 + \frac{1}{n} \right)^n = e. \] Use the previous exercise to show that \[ \lim_{n \to \infty} \frac{n}{(n!)^{1/n}} = e. \]
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