The sum of the first six terms in a geometric sequence of real numbers is 252.
Find the sum of the first four terms when the sum of the first two terms is 12.
Sn = A1 - A1Rn
divided by 1 - R
R [tex]\neq 1[/tex]
(I cant figured out how to make the "divided by" sign)
The Attempt at a Solution
Well, I subtracted 12 from 252 to find the sum of the last 4 terms and got 240. I could think of nothing more to do after this though.