Paper 1 · Proofs Lesson 5 of 5

Proof 5 – Prove Sum to Infinity formula (Geometric Sequences)

This tutorial is for members

Read the lesson notes free below — subscribe to watch the full worked video and download the PDF.

Subscribe for full access · €199/yr

You’ll learn

  • Prove the sum-to-infinity formula S∞ = a/(1 − r) for |r| < 1

💬 Stuck on something in this lesson?

Send your question with this lesson’s name attached — you’ll get a reply by email.