Mathematical formulas

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Subjects
Algebra
Sequences, finite series, and recurrences
Arithmetic sum

14. Sequences, finite series, and recurrences

Arithmetic sum

Level: fundamental

In 14. Sequences, finite series, and recurrences

Formula

S_{n} = \frac{n}{2} (a_{1} + a_{n})

Detail

Sum of the first n terms of an arithmetic sequence.

Related formulas

Related
Arithmetic sequence
$a_{n} = a_{1} + (n - 1) d$
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