---
title: What Is a Geometric Sequence?
description: "Geometric sequence explained: an=a1r^(n-1) (n>=1), sum Sn=a1(1-r^n)/(1-r) (r!=1), with behavior by r>1, 0<r<1, r<0. Clear guide."
url: https://astra-ai.co/en-IN/videos/sequences/chapter-5f43386f/what-is-a-geometric-sequence/
locale: en-IN
type: video-lesson
published: 2026-10-01T21:51:57.037Z
updated: 2026-10-01T21:51:57.037Z
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---

# What Is a Geometric Sequence?