# How do you find the fourth partial sum of #Sigma 5(1/2)^i# from i=1 to #oo#?

##### 1 Answer

#### Answer:

#### Explanation:

A series is an infinite sum, i.e. a sum with infinite terms.

Partial sums are approximations of the series, where you reduce it to a finite number of terms. In fact, the

So, the fourth partial sum is the sum of the first

First of all, let's factor the

Now we can simply translate the notations, plugging