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Algebra · sequences

Arithmetic Series Sum Formula

Finds the sum of the first n terms of an arithmetic sequence.

Sₙ = n(a₁ + aₙ) / 2

Variables

Sₙ
sum of n terms
n
number of terms
a₁
first term
aₙ
last term

Reference details

Subject
Algebra
Topic
sequences
Plain text
S_n = n(a_1 + a_n) / 2

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