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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 n2(a_1+a_n)

Tags

algebra
algebra formula
sequences
sequences series finitas

Detail

Sum of the first n terms of an arithmetic sequence.

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Arithmetic sequence
$a_n=a_1+(n-1)d$
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