●●● ●●●● ●●●●● 1.5.2 The Multiplication Rule ●●●● ●●●●● ●●●● ●●●● Assuming that all of the conditioning events have positive probability, we have P4)=P4p(4(An)P=4) The above formula can be verified by writing n24)=P(4) 4∩42)P(41∩A2∩42) P(4)P(41∩A2) A For the case of just two events, the multiplication rule is simply the definition of conditional probability P(4n4)=P4P(441.5.2 The Multiplication Rule