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Q1030 - ArqMath20

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English	No label defined	No description defined

Statements

math-stackexchange-category

sequences-and-series

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B.9

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arqmath formula id

q_52

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math stackexcange post id

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relevant answers

Defining formula

\sum_{n = 0}^{N} n x^{n} = x \sum_{n = 0}^{N} n x^{n - 1} = x \sum_{n = 0}^{N} \frac{d}{d x} x^{n} = x \frac{d}{d x} \sum_{n = 0}^{N} x^{n} = x \frac{d}{d x} \frac{x^{N + 1} - 1}{x - 1}

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