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$y = \frac{1}{x}$ হলে, y_n = কত?

\frac{n!}{x^{n + 1}}

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

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

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

ANS : 2

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