ProbabilityKey Facts

Key Facts

Part of Venn Diagrams — GCSE Mathematics

This key facts covers Key Facts within Venn Diagrams for GCSE Mathematics. Revise Venn Diagrams in Probability for GCSE Mathematics with 14 exam-style questions and 12 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 2 of 6 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 2 of 6

Practice

14 questions

Recall

12 flashcards

Key Facts

Venn Diagram: A visual representation using circles to show relationships between events
Universal Set (U): The rectangle containing all possible outcomes
Intersection (A ∩ B): The overlap region where both events occur
Union (A ∪ B): The combined region where at least one event occurs
Complement (A'): The region outside event A but inside the universal set
Numbers in regions represent frequencies or probabilities

Practice Questions for Venn Diagrams

In a Venn diagram with two events A and B, which symbol represents the region where BOTH events occur at the same time?

A. A ∩ B
B. A ∪ B
C. A'
D. U

1 markfoundation

A student claims: 'To find P(A ∪ B), you simply add P(A) and P(B).' Explain why this is not always correct, and state the correct formula with a reason.

3 markshigher

Quick Recall Flashcards

What does A ∪ B mean?

The union - outcomes where AT LEAST ONE of event A or event B occurs. Includes only A, only B, and A ∩ B. The ∪ symbol looks like a U for Union.

What does A ∩ B mean?

The intersection - outcomes where BOTH event A AND event B occur. On the diagram it is the overlapping region between the two circles.

Key Facts

Key Facts

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Practice Questions for Venn Diagrams

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