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Coefficient of $x^{4}$ in the expansion of ${(\frac{x}{2} - \frac{3}{x^{2}})}^{10}$ is

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Correct option is B

Tr+1=10Crx210−r−3x2r=10Cr(−3)r210−rx10−3rFor the coefficient of x4 set 10 – 3r = 4⇒r=2.

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Coefficient of x4 in the expansion of x2−3x210 is

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Coefficient of $x^{4}$ in the expansion of ${(\frac{x}{2} - \frac{3}{x^{2}})}^{10}$ is