Hey,(adsbygoogle = window.adsbygoogle || []).push({});

I am wondering if anyone could algebraically prove that [tex]\sum{n=0=>inf} (n / 2^n)[/tex] = 2. There is some simple trick to it but I am stumped. :/

Here is a clearer picture of my summation:

http://img638.imageshack.us/img638/2114/texer1.png [Broken]

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Series proof

**Physics Forums | Science Articles, Homework Help, Discussion**