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Algebra · sequences

Finite Geometric Series Sum Formula

Finds a finite geometric-series sum when r is not 1.

Sₙ = a₁(1 − rⁿ) / (1 − r)

Variables

Sₙ
sum of n terms
a₁
first term
r
common ratio
n
number of terms

Reference details

Subject
Algebra
Topic
sequences
Plain text
S_n = a_1(1-r^n)/(1-r)

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