BitsatSequences And SeriesBITSAT 2025MCQ+3 / -12025The coefficient of $x^n$ in the expansion of $\frac{1-a x-x^2}{e^x}$ isA$\frac{(-1)^n}{n!}\left\{-n^2-n(a+1)+1\right\}$B$\frac{(-1)^n}{n!}\left\{n^2-n(a+1)-1\right\}$C$\frac{(-1)^n}{n!}\left\{-n^2+n(a+1)+1\right\}$DNone of the aboveCheck AnswerClear SelectionReveal AnswerShow Explanation
