For a sequence the sum of the first terms is

MATHEMATICS · Single correct · CBSE · Mathematics · Arithmetic Progressions · Arithmetic Progressions

Problem

For a sequence the sum of the first

n

terms is

S_n = n(2n + 3)

. Which pair correctly lists the general term

a_n

and the common difference

d

of this sequence? (a)

a_n = 2n + 3,\; d = 2

(b)

a_n = 4n + 1,\; d = 4

(c)

a_n = 4n - 1,\; d = 4

(d)

a_n = 2n^2 + 3,\; d = 4n