JEE MATHEMATICS MCQ: SEQUENCE OF SERIES

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Analyzing +4 | -1

\sum_{r=1}^n \frac{r^2-r-1}{(r+1) !}

is equal to

View answer and explanation

Correct option: B

\frac{-1}{(n+1)(n-1) !}

Option A (

\frac{{-1}}{{(n+1)(n-1)!}}

) is correct because the summation can be simplified by breaking the fraction into partial fractions and then telescoping the series.

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