Question

How do you find the sum of the infinite geometric series 8+4+2+...?

Answer 1

It is `16`

Explanation:

The sum is

`S=a_1/(1-r)` where `a_1` is the first term and `r` the ratio so we have

`S=8/(1-1/2)=16`

We can use the formula above because is `absr=1/2<1`