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y = \frac{1}{a - x}

y_{n}

= কত?

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

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

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

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

ANS : 2

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