Venn Diagrams with Conditional Probability (Edexcel A Level Maths): Revision Note

Further Venn Diagrams

What do you mean by further Venn diagrams?

• The Venn diagrams used here are no more complicated than those in the first Venn Diagrams revision note, however

  • Venn diagrams, and the wording/terminology in questions, may now involve the use of set notation including the symbols (union),  (intersection), ‘ (complement) and | (“given that”)

  • Conditional probability problems can be solved using Venn diagrams

How do I solve conditional probability problems using Venn diagrams?

• Interpreting questions in terms of AND (), OR (), complement ( ‘ ) and “given that” ( | )

• Conditional probability may now be involved too

• Use mini-Venn diagrams to sketch and shade the regions you are dealing with – use different colours if available or different styles of shading if not

  • Shading can help you see the answer

since  shade B first, then shade 

the answer will then be