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Algebra · sequences

Infinite Geometric Series Sum Formula

Gives an infinite geometric-series sum for |r| < 1.

S = a₁ / (1 − r)

Variables

S
infinite sum
a₁
first term
r
common ratio

Conditions

Valid only when |r| < 1.

Reference details

Subject
Algebra
Topic
sequences
Plain text
S = a_1/(1-r)

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