Solution:
be the general term in the expansion of
For the integral power of x, r should be even integer.
Sum of coefficients
Aliter We have,
On adding Eqs. (i) and (ii), we get
The sum of coefficients of integral powers of r in the binomial expansion of is
be the general term in the expansion of
For the integral power of x, r should be even integer.
Sum of coefficients
Aliter We have,
On adding Eqs. (i) and (ii), we get