If the expression in powers of of the function is then the coefficient of in the expansion is
Explanation for the correct option:
Given function is
We know that the binomial expansion for
Therefore, coefficients of in the above expansion can be
The above expression is in the form of terms of a Geometric progression with first term as and common ratio as
The general formula for sum of terms of a Geometric progression is
Hence, the correct answer is option(B) i.e. .