Mathematics A-Level
Sum of an arithmetic series
What Sum of an arithmetic series means in Mathematics A-Level, as defined for Pearson Edexcel.
Definition of Sum of an arithmetic series
Check what you remember
Read the wording for your board, then hide it and explain Sum of an arithmetic series in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: Pearson Edexcel
The sum of the first n terms is Sₙ = n/2[2a + (n − 1)d], equivalently Sₙ = n/2(a + l) when the last term l is known.
Topics that use Sum of an arithmetic series
- Sequences and series (Pearson Edexcel A-Level)
Related terms
- Common difference and linear structure
- Finite versus infinite binomial series
- Forming and solving equations in n
- nth term formula
- periodic sequence
- Series
- Validity condition
- Arithmetic
Using Sum of an arithmetic series in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Mathematics questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Mathematics A-Level termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge