JEE Main 2019 — Math solution

JEE Main2019Math

Let $S_{k} = \frac{1 + 2 + 3 + .... + k}{k}$ . If

$S_{1}^{2} + S_{2}^{2} + ... + S_{10}^{2} = \frac{5}{12} A,$ then A is equal to

Solution

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