- Identify event type - independent, dependent, or mutually exclusive
- "And" means multiply - P(A and B)
- "Or" usually means add - P(A or B)
- Watch for overlap - subtract P(A and B) if events can occur together
- Use tree diagrams for complex scenarios
This exam tips covers Exam Tips 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 4 of 5 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
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