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If lim (xto1)(x^(1)+x^(2)+x^(3)+"..."+x^...

If `lim _(xto1)(x^(1)+x^(2)+x^(3)+"..."+x^(n)-n)/(x-1)=820,(nin N)`
then the value of n is equal to

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JEE MAINS PREVIOUS YEAR-JEE MAINS 2020-MATHEMATICS
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