How to derive general formula in algebra
$E x = 2, 5, 10, 17, 26, 37, 50, 65, 82, 101,$ ?

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Solution

$2 + 5 + 10 + 17 + 26 + 37 + 50 + 50 + 65 + 82 + 101 = \frac{101 * (102)}{2} = \frac{10302}{2} = 5151$

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