Let Sn be the sum of the first n terms of an AP. If S2n = 3n + 14n2, then what is the common difference?

Let Sn be the sum of the first n terms of an AP. If S2n = 3n + 14n2, t

1.	Let Sn be the sum of the first n terms of an AP. If S2n = 3n + 14n2, then what is the common difference?
A.	5
B.	6
C.	7
D.	9
Answer» D. 9

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Let Sn be the sum of the first n terms of an AP. If S2n = 3n + 14n2, then what is the common difference?

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