Sum of Geometric Sequence and Series | GCSE, AS & A Level Maths (2026/27)

In this lesson, we explain how to find the sum of a geometric sequence and geometric series using clear and simple step-by-step methods.

Geometric sequences and series are important topics in algebra and appear frequently in GCSE, AS & A Level Maths and university foundation courses. This video will help you understand how to apply the correct formulas and solve exam-style questions confidently.

🔎 What You Will Learn

✔ What a geometric sequence is
✔ How to identify the common ratio (r)
✔ How to find the nth term of a geometric sequence
✔ How to calculate the sum of a geometric series
✔ Using the geometric series formula correctly
✔ Step-by-step exam techniques
✔ Common mistakes to avoid

📚 Key Formula Covered

Sum of a geometric series:

Sₙ = a(1 − rⁿ) / (1 − r) (when r ≠ 1)

Where:

a = first term r = common ratio n = number of terms

🎯 Who This Video Is For

This lesson is suitable for:

• GCSE Mathematics students
• AS & A Level Mathematics students
• College Algebra students
• Precalculus students
• Engineering students
• Anyone learning sequences and series

🎓 Academic Support Available

I provide academic support in:

• Mathematics (GCSE, AS & A Level, University)
• Physics
• Chemistry
• Calculus I, II & III
• Engineering Mathematics
• Assignment Help
• Project & Dissertation Assistance

Contact via email: successgold123@gmail.com

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📌 Hashtags

#GeometricSeries, #GeometricSequence, #SequencesAndSeries, #GCSEMaths, #ALevelMaths, #PureMaths, #MathTutorial, #Algebra, #MathHelp,

Видео Sum of Geometric Sequence and Series | GCSE, AS & A Level Maths (2026/27) канала MathSci Consult