Posted by haifeng on 2024-09-25 16:47:34 last update 2024-09-25 16:50:27 | Answers (0) | 收藏
证明
\[\lim\limits_{n\rightarrow\infty}\dfrac{n}{2^n}=0.\]
Hint. 当 $n\geqslant 2$ 时,
\[ 2^n=(1+1)^n >\frac{n(n-1)}{2} \]
