If the coefficients of x^7 in (x^2+ 1 bx )^ 11 and x^ -7 in (x- 1 bx^2 )^ 11 , b 0, are equal, then the value...

Question

If the coefficients of x^7 in (x^2+ 1 bx )^ 11 and x^ -7 in (x- 1 bx^2 )^ 11 , b 0, are equal, then the value of b is equal to :

Accepted Answer

(B)

JEE Main 2021 Mathematics question