How do you find #S_n# for the geometric series #a_3=-36#, #a_6=-972#, #n=10#?
1 Answer
Jul 21, 2017
The general form for a Geometric progression is:
Given:
Divide the latter by the former:
This means that:
Solve for r:
Use
We can use the formula for the Finite Sum of Geometric Series :
Substituting