If the sum of first n terms of an AP is An + Bn² where A and B are constants. The common difference of AP will be
A. A + B
B. A – B
C. 2A
D. 2B
Answer:D
If the sum of first n terms of an AP is An + Bn² where A and B are constants. The common difference of AP will be
A. A + B B. A – B C. 2A D. 2B