1. The problem statement, all variables and given/known data Find the sum of the series. Summation (n/2^n) from n = 1 to inf 2. Relevant equations Summation (x^n) = 1/1-x 3. The attempt at a solution n/2^n n*(1/2)^n Not sure what this equals after this... I was thinking (1/1-0.5) but that is a guess. There are other ones like this, i have no idea how to do them, so any help on how to start and/or finish them will be appreciated.