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Question
Find the middle term in the expansion of:
(iv) \[\left( \frac{x}{a} - \frac{a}{x} \right)^{10}\]
Solution
(iv) Here,
n = 10 (Even number)
Therefore, the middle term is the \[\left( \frac{n}{2} + 1 \right)th\] i.e. 6th term
\[ T_6 = T_{5 + 1} \]
\[ =^{10}{}{C}_5 \left( \frac{x}{a} \right)^{10 - 5} \left( \frac{- a}{x} \right)^5 \]
\[ = - \frac{10 \times 9 \times 8 \times 7 \times 6}{5 \times 4 \times 3 \times 2} = - 252\]
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