If the sum Sn of n terms of a progression is a cubic polynomial in n, then the progression whose sum of n terms is Sn – Sn-1 is
A. An A. P.
B. A G. P.
C. A H.P.
D. An A. G. P.
Answer:A
If the sum Sn of n terms of a progression is a cubic polynomial in n, then the progression whose sum of n terms is Sn – Sn-1 is
A. An A. P. B. A G. P. C. A H.P. D. An A. G. P.