Mathematics GCSE
Complementary Event
What Complementary Event means in Mathematics GCSE, as defined for AQA.
Definition of Complementary Event
Check what you remember
Read the wording for your board, then hide it and explain Complementary Event in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
The event that something does not happen. P(A') = 1 - P(A).
Topics that use Complementary Event
- Probability (AQA GCSE)
Related terms
- analysis
- Combined experiments
- Equally likely events
- Equally likely outcomes
- expected outcomes
- frequency table
- frequency tree
- Independent and dependent events
Using Complementary Event 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 GCSE termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge