Basic Formulas for Probabilities

• Product Rule: probability 24#24 of a conjunction of two events A and B:
  
  25#25
  
  

• Sum Rule: probability of a disjunction of two events A and B:
  
  26#26
  
  

• Theorem of total probability: if events 27#27 are mutually exclusive with 28#28, then
  
  29#29