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If the sum of n terms of an A.P. is given by Sn = 3n + 2n^2,

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If the sum of n terms of an A.P. is given by Sn = 3n + 2n2, then the common difference of the A.P. is

(A) 3 

(B) 2 

(C) 6 

(D) 4

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Answer is (D)

Given that Sn = 3n + 2n2

S1 = 3(1) + 2(1)2 = 5 = t1

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