Ononot — Let Sn be the sum of n terms of an AP. If Sn = An^2 + Bn + C

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Arithmetic Sequenceshard

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Let $S_n$ be the sum of $n$ terms of an AP. If $S_n = An^2 + Bn + C$ with $C \neq 0$ , which property of the sequence $\{a_n\}$ is true?