Series $\sum=?iso-8859-1?Q?=5F{n_=3D_0}^{\infty}_?=(-1)^n \frac{5}{4^n}$ – math.stackexchange.com

Series $\sum_{n = 0}^{\infty} (-1)^n \frac{5}{4^n}$ – math.stackexchange.com

$$\sum_{n = 0}^{\infty} (-1)^n \frac{5}{4^n}$$ I tried writing out the
values for n = 0, 1, 2, 3, 4 so try to find partial sum equation but was
unsuccessful.