This key facts covers Key Facts within Combined Events for GCSE Mathematics. Revise Combined Events in Probability for GCSE Mathematics with 11 exam-style questions and 2 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 2 of 5 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Key Facts
- Independent Events: One event doesn't affect the other
- Dependent Events: One event affects the probability of the other
- Mutually Exclusive: Events cannot happen at the same time
- Addition Rule: P(A or B) = P(A) + P(B) - P(A and B)
- Multiplication Rule: P(A and B) = P(A) × P(B|A)
- For independent events: P(A and B) = P(A) × P(B)
Practice questions for Combined Events
A fair coin is flipped and a fair die is rolled. What rule is used to find P(heads AND rolling a 3)?
Explain the difference between independent and dependent events in probability. Give an example of each.
Quick recall flashcards
For independent events, what is P(A and B)?
P(A and B) = P(A) × P(B)
What are independent events?
Events where one event doesn't affect the probability of the other