# How to find closed form of summation

Just replace n in the formula by the relevant expression. answered Oct 21, 2018 at 8:12. Siong Thye Goh. 145k 20 84146. Add a comment. Post Your Answer. 1. r = 1 r r ( r +) ( r +)

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## Closed form summation of C-finite sequences

Convert each to closed form: 1. Sum from i=1 to n of: $$\frac{n}{a^n}$$ 2. Sum from i=1 to n of: $$\frac{1}{a^n}$$ Thanks. P.S. I know how to do it if it was an infinite
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## 2.2Arithmetic and Geometric Sequences

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