Question 1: The middle term in the expansion of $\left(x^2+\dfrac{1}{x^2}+2\right)^{n}$ is
(a) $\dfrac{n!}{\left(\dfrac{n}{2}!\right)^2}$
(b) $\dfrac{(2n)!}{\left(\dfrac{n}{2}!\right)^2}$
(c) $\dfrac{(2n)!}{\left(n!\right)^2}$
(d) $\dfrac{1.3.5\ldots(2n+1)}{n!}2^{n}$
Solution :
Comments
Post a Comment