Question

Sigma notation

Answer 1

Please walk me through the steps so I can learn how to do it.

Answer 2

this is a different series, it is geometric.

Answer 3

So, we are going into geometric series without comprehending the arithmetic series.
I am not your teacher, but I would like, at least after this question, for you to rvw arithmetic series.

Answer 4

as far as this question goes though,

Answer 5

\(\large\color{black}{ \displaystyle {\rm S}_n=\frac{ \left(a_1\right) \left(1-r^n\right) }{1-r}}\)

Answer 6

a sum of certain number of terms in geometric sequence is given by this formula.

Answer 7

can you find the \(a_1\) for me?

Answer 8

I'm not sure... :(

Answer 9

plug in 1 for n, into the \(2(2)^{n-1}\)