JEE Main 20202 Sep, Morning shiftMathematicsMediumLimit, Continuity and Differentiability420× since 2002If limx→1x+x2+x3+...+xn−nx−1\mathop {\lim }\limits_{x \to 1} {{x + {x^2} + {x^3} + ... + {x^n} - n} \over {x - 1}}x→1limx−1x+x2+x3+...+xn−n = 820, (n ∈\in∈ N) then the value of n is equal to _______.Your answerType your answer. Integers and decimals are accepted.CheckSkip · show solution
