The middle term in the expansion of \({\left( {x - \frac{1}{x}} \right)^{18}}\)

1
\( \;{\;^{18}}{C_{10}}\;\)
2
\(-{\;^{18}}{C_{10}}\;\)
3
\(-{\;^{18}}{C_9}\;\)
4
\(\;{\;^{18}}{C_9}\;\)

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