Question

How do you figure out the sum of (sum ((0.9)^(n-1))) from n=1 to infinity? I got the first five partial sums of the series.

Answer 1

\[\frac{a}{1-r}\] with \(a=1,r=.9\)

Answer 2

Oh, ok. Thank you!!

Answer 3

yw

Answer 4

i hope so

Answer 5

you can do it in your head
one minus point nine is point one
the reciprocal of point one is ten