Question

The middle term in the expansion of $( x + \frac{1}{x} )^{2n}$ is $1.3.5 . . .$ $\frac{(2n-1)}{2n\ !}$

• A. 1.3.5...(2n-1)(2n)/n!
• B. $1.3.5...(2n-1)/n!.2n$
• C. 2n!/n!.2n
• D. none of the above

Answer 1

Answer: (B)

$1.3.5...(2n-1)/n!.2n$

Answer 2

The correct option is (B): 1.3.5...(2n-1)/n!.2n