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Questions  >>  CBSE XI  >>  Math  >>  Binomial Theorem
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Q)

If the term free from $x$ in the expansion of $(\sqrt x-\large\frac{k}{x^2})^{10}$ is $405$,find the value of $k$.

$\begin{array}{1 1}(A)\;\pm 1\\(B)\;\pm 2\\(C)\;\pm 3\\(D)\;\pm 4\end{array} $

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