Hi. I just completed a C2 mock today, and I thought I was pretty confident in geometric series...until I got this question. (not exact, I'm paraphrasing)
The sum of the first 2 terms in a geometric series with all positive terms is 32 and the sum to infinity is 164.
I) Find the common ratio
II) Find the first term.
The second part I know how to do, IF I could figure out the common ration. The problem is I keep getting weird equations like r-1=32a and a=162-162.
Any help would be appreciated, thanks.
Tricky geometric series question watch
- Thread Starter
- 14-04-2016 18:50
- 14-04-2016 19:39