Question

Which limit step is correct for the integral below?

$$\int_{25}^{\infty} \frac{1}{x}\,dx$$

Accepted Answer

$$\lim_{b	o\infty} [\ln(x)]_{25}^{b}=+\infty$$

Answer

$$\lim_{b	o\infty} [-\frac{1}{x}]_{25}^{b}=+\infty$$

Answer

$$\lim_{b	o\infty} [\ln(x)]_{25}^{b}=0$$

Answer

$$\lim_{b	o\infty} [\ln(x)]_{25}^{b}=-\infty$$

Practice: Integration - Improper Integral Limit