Ononot — If the sum of the first n terms of an AP is Sn, and the rati

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Arithmetic Sequenceshard

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If the sum of the first $n$ terms of an AP is $S_n$ , and the ratio $\frac{S_{kx}}{S_x}$ is independent of $x$ for all $x$ , what is the relation between the first term $a_1$ and the common difference $d$ ?