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$y = \frac{1}{x}$ হলে y_n =?

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

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

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

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

ANS : 4

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