Venn Diagrams with Conditional Probability (Cambridge (CIE) 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

  • questions may use set notation as well, or alongside contextual questions

  • there may be more detailed use of conditional probability

  • mutually exclusive, three events and other unusual Venn diagram setups may be involved

How do I solve conditional probability problems using Venn diagrams?

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

• 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