\[ {Multiplication{\text{ }}Rule{\text{ }}Of{\text{ }}Probability,{\text{ }}P\left( {AB} \right) = P\left( {A/B} \right)P\left( B \right)} \]
\[ {Addition{\text{ }}Rule{\text{ }}Of{\text{ }}Probability,{\text{ }}P\left( {A{\text{ }}or{\text{ }}B} \right) = {\text{ }}P\left( A \right) + P\left( B \right) - P\left( {AB} \right)} \]