So the 1/2 is just clarifying an alternating series? I am completely lost on that problem. for the second i don't know what you mean either haha... all i know right now is it is an alternating problem... I have been trying to do these for like 3 hours to no success haha..
edit---
Well...
Ok i have a few here that i have no idea what to do
b]1. Homework Statement [/b]
Find the nth term in the series
1/2, 1/3, 2/9, 4/27, 8/81, 16/243
also
\Sigma (-1)^n-1/ 5n+1
find the sum
Urgent help neededdd ahha.. Thanks