Ononot — If the sum of the first n terms of an AP is Sn = 2n^2 + 5n,

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Arithmetic Sequenceshard

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If the sum of the first $n$ terms of an AP is $S_n = 2n^2 + 5n$ , and the sum of the first $k$ terms is $S_k = 250$ , find the value of $k$ .