Subjects/Algebra/Sequences, finite series, and recurrences/Finite geometric sum14. Sequences, finite series, and recurrencesFinite geometric sumLevel: fundamentalIn 14. Sequences, finite series, and recurrencesFormulaCopy LaTeXSn=a11−r1−rn(r=1)DetailSum of n terms of a geometric sequence.Related formulasRelatedGeometric sequencean=a1rn−1Open formulaOpen in sectionRelatedInfinite geometric seriesk=0∑∞ark=1−ra,∣r∣<1Open formulaOpen in section