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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? 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
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Answer 3
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