Binomial Expansion Formula

Expression =

The coefficient of in
the coefficient of in

When exponent is then total number of terms are .
So, total number of terms in
Middle term is

We have coefficient of in
= coefficient of in
= coefficient of in + coefficient of in
+ constant term is

From the given condition, replacing a by
and respectively, we get
.....(i)
and ....(ii)
Multiplying (ii) and (i) we get required result i.e.,

Given, and the term in the
expansion of
term in expansion of


Since occurs in

thus the coefficient of

The correct option is(A): .