Question

in the expansion of
23. The coefficient of
is
(2n)!
1) (n-1): (n+1)
2)(n-1)!(n+1)!
(2n)!
(2n-1)! (2n +1)! (2n-1)!(2n +1)!
3)​

Answer 1

Answer:

option no- 2 is right answer