# Probability Density Function

1. Aug 9, 2008

### Trung

I feel embarassed for asking, but is there a fast way to calculate this without using integration by parts?

$$\int$$ 2e^(-2x)x^-1dx, 0 <= x < infinity

There's supposed to be some kind of trick, right?

2. Aug 9, 2008

### gel

$$\int_0^\infty\frac{2e^{-2x}}{x}\,dx=\infty.$$

3. Aug 10, 2008

### Focus

Sorry but how is this related to PDFs?