The complement of event A contains all outcomes where A does not occur.
What Is Complementary Event?
The complement of event A contains all outcomes where A does not occur.
Examples of Complementary Event
1
If A is “roll a 6”, Aᶜ is “roll 1–5”.Formula and Key Points
Formula / rule
P(Aᶜ)=1−P(A)
- Know the definition and standard notation for Complementary Event.
- Be able to recognise or compute complementary event in a small example.
- Connect the concept to nearby topics in the same subject before using it in larger CSE problems.
Why This Matters in Computer Science
Used in randomized algorithms, artificial intelligence, reliability, networking, security and data science.
Related Math Terms
Complementary Event: Frequently Asked Questions
What is Complementary Event?
The complement of event A contains all outcomes where A does not occur.
Why is Complementary Event useful in computer science?
Used in randomized algorithms, artificial intelligence, reliability, networking, security and data science.