Ononot — If the sum of the first n terms of an AP is Sn = n^2, what i

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Arithmetic Sequenceshard

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If the sum of the first $n$ terms of an AP is $S_n = n^2$ , what is the sum of the first $n$ even-indexed terms: $S' = a_2 + a_4 + \dots + a_{2n}$ ?