The term independent of $x$ in ${\left( {\sqrt x - \frac{2}{x}} \right)^{18}}$ is
The term independent of $x$ in ${\left( {\sqrt x - \frac{2}{x}} \right)^{18}}$ is
- A
$^{18}{C_6}{2^6}$
- B
$^{18}{C_6}{2^{12}}$
- C
$^{18}{C_{18}}{2^{18}}$
- D
None of these
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