Geometric Series

Examples, videos, activities, solutions and worksheets that are suitable for A Level Maths. How to prove the formula for the sum of the first n terms of a geometric series? How to prove the formula for the sum to infinity of a geometric series? How to solve word problems using geometric series?

Geometric Series - Proof of the Sum of the first n terms
In this video you are shown how to prove the formula for the sum of the first n terms of a geometric series.

Geometric Series - Sum to Infinity
In this video you are shown how to prove the formula for the sum to infinity of a geometric series

A-level Maths : Geometric Series (investment problem)
Example:
A savings scheme is offering a rate of interest of 3.5% per annum for the lifetime of the plan. Alan wants to save up £20,000. He works out that he can afford to save £500 every year, which he will deposit on 1st January. If interest is paid on 31st December, how many years will it be before he has saved up his £20,000?

Geometric Series : Sum to infinity example

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