Two middle terms in the expansion of ${\left( {x - \frac{1}{x}} \right)^{11}}$ are
Two middle terms in the expansion of ${\left( {x - \frac{1}{x}} \right)^{11}}$ are
- A
$231x$ and $ \frac{{231}}{x}$
- B
$462x$ and $\frac{{462}}{x}$
- C
$ - 462x$ and $\frac{{462}}{x}$
- D
None of these
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