Question

Which equation represents the partial sum of the geometric series?

Answer 1

The geometric sequence after the sigma is 125(1/5)^(n-1) so the first four terms are

125, 25, 5, and 1

So A is the sum of the first four terms...

The more common formula for the sum of a geometric sequence is:

s(n)=a(1-r^n)/(1-r), a=initial term, r=common ratio, n=term number

With the more specific infinite sum if r^2<1 as n approaches infinity

s=a/(1-r)

Answer 2

Answer:

the first one, a

Step-by-step explanation: