In the expansion of ${\left(9x-\frac{1}{3\sqrt{x}}\right)}^{18},x0$, if the term independent of $x$ is $(221)k$, then $k$ is equal to: [JEE Main 2026, 4 Apr (Shift 2)]

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In the expansion of ${\left(9x-\frac{1}{3\sqrt{x}}\right)}^{18},x>0$, if the term independent of $x$ is $(221)k$, then $k$ is equal to: [JEE Main 2026, 4 Apr (Shift 2)]

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In the expansion of \({\left(9x-\frac{1}{3\sqrt{x}}\right)}^{18},x>0\), if the term independent of \(x\) is \((221)k\), …

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