How can I evaluate $\sum_{n=1}^\infty \frac{2n}{3^{n+1}}$
I need to compute the sum of $$\sum_{n=1}^{\infty}\frac{n}{2^n}$$ using power series.
Any hints of how should I do that?
How can I evaluate $\sum_{n=1}^\infty \frac{2n}{3^{n+1}}$
I need to compute the sum of $$\sum_{n=1}^{\infty}\frac{n}{2^n}$$ using power series.
Any hints of how should I do that?