Question

a binomial expression (x+1)^n was given to the students in a class. James by mistake copied x as 1/x .in this confusion he came home and decided to calculate the expansion of composite polynomial obtained by multiplying (x+1)^n with (1/x+1)^n .what value did James obtain for the constant term.

options:- a.(2n-1)!/(n-1)!(n+1)!
b.(2n)!/(n!)²
c.(2n-2)!/(n-1)!n!
d.(2n)!/(n-1)!(n+1)!
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Answer 1

(2n)!/(n!)2

HERE IS UR ANSWREE