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arithmetic sequence sum

To find the sum of the first

n

$n$ terms of an arithmetic sequence, use the formula:

S_{n} = \frac{n}{2} (2 a + (n - 1) d)

$S_{n} = \frac{n}{2} (2 a + (n - 1) d)$

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⎡ ⎢ ⎣ \begin{matrix} x^{2} & \frac{1}{2} \sqrt{π} & \int x d x \end{matrix} ⎤ ⎥ ⎦

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$