If lim x→1 (x+x²+x³+...+xⁿ−n)/(x−1)... | Limits | JEE Main 2020

JEE Main 2020

02-09-2020 S1

Question

If $\lim _{x \rightarrow 1} \frac{x+x^2+x^3+\ldots .+x^n-n}{x-1}=820,(n \in N)$ then the value of $n$ is equal to $\_\_\_\_$

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Question Tags

JEE Main

Mathematics

Medium

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