A-Level Maths Edexcel (9MA0)

Understand and work with geometric sequences and series, including the formulae for the $n$th term and the sum of a finite geometric series; the sum to infinity of a convergent geometric series, including the use of $|r| < 1$; modulus notation.

The proof of the sum formula should be known.

Given the sum of a series students should be able to use logs to find the value of $n$.

The sum to infinity may be expressed as $S_∞$.