No label defined (Q1030)

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Language	Label	Description	Also known as
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}nx^{n}=x\sum _{n=0}^{N}nx^{n-1}=x\sum _{n=0}^{N}{\frac {d}{dx}}x^{n}=x{\frac {d}{dx}}\sum _{n=0}^{N}x^{n}=x{\frac {d}{dx}}{\frac {x^{N+1}-1}{x-1}}

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