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

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Correct option is A

for the term free from x,10−5r2=0⇒r=2 10C2(−k)2=405 ∴k=±3

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If the term free from x is the expansion of x−kx210 is 405, then the value of k .

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