Venn Diagrams

• What does it mean if A and B are mutually exclusive?

  They cannot occur together.
• If A and B are mutually exclusive, what is P(A∩B)?

  0
• If A and B are mutually exclusive, what is P(A∪B)?

  P(A∪B) = P(A) + P(B)
• How do we check if A and B are independant?

  Check if P(A ∩ B) = P(A) x P(B)

  or

  Check if P(A|B) = P(A)
• What does it mean if A and B are independant?

  Knowing the outcome of A does not affect the outcome of B