If the `n^(th)` term of a certain series is of the form a + bn + c. `2^n` where a, b, c are constants. The first three terms are 2, −1, and −3, then show that a, c, b are in A.P. Also find the sum of the series :

Options

A. `3n − 2n^2 + 3n − 1`
B. `2^n − 2n^2 + 3n − 1`
C. `2n − 2n^2 + 5n − 1`
D. None of These

Answer

B