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## Homework Statement

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.

## Homework Equations

S

_{n}= A

_{1}- A

_{1}R

^{n}

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.