qqp question1: What is the value of [math]\lim\limits_{x\to\infty} \frac{1+2+3+\cdots x}{x²}[/math]? question2: If [math]n\in\mathbb{N}[/math], what is the value of [math]\lim_{x\to\infty} x^n \cdot e^{-x} [/math]?