Question

how do i start to solve this? will give medals!
Find the first 4 partial sums of the sequence, then find the value for S(sub n):
a(sub n) = 2/(3^n)

Answer 1

@Nnesha

Answer 2

A partial sum \(S_k\) for a sequence \(a_n\) is given by
\[\sum_{n=1}^ka_n=a_1+a_2+a_3+\cdots+a_k\]
We call \(S_k\) the \(k\)th partial sum for the sequence \(a_n\).

The first partial sum, for example, is simply
\[\sum_{n=1}^1a_n=a_1=\frac{2}{3^1}=\frac{2}{3}\]
Make sense?