| Line 8: | Line 8: | ||
<math>\sum_{n = M}^N \alpha^n = \frac{\alpha^M - \alpha^{N-1}}{(1 - \alpha)}</math> | <math>\sum_{n = M}^N \alpha^n = \frac{\alpha^M - \alpha^{N-1}}{(1 - \alpha)}</math> | ||
| − | Is this formula correct? Please comment. | + | Is this formula correct? For what values of the parameters is the formula valid? Please comment. |
---- | ---- | ||
==Share your answers below== | ==Share your answers below== | ||
Revision as of 03:58, 9 September 2011
Contents
When is this super duper geometric series formula valid?
A student in ECE301 once wrote the following formula on his exam:
$ \sum_{n = M}^N \alpha^n = \frac{\alpha^M - \alpha^{N-1}}{(1 - \alpha)} $
Is this formula correct? For what values of the parameters is the formula valid? Please comment.
You will receive feedback from your instructor and TA directly on this page. Other students are welcome to comment/discuss/point out mistakes/ask questions too!
Answer 1
Write it here.
Answer 2
Write it here.
Answer 3
Write it here
