what is the conceptual def of P(A|B)?
the conditional probability of event A given an B has happened
what is the mathematical def of P(A|B)?
P(A ∩ B)/P(B)
what is the multiplication rule for conditional probability?
P(E_1 ∩ E_2 ∩ … ∩ E_n) = P(E_1) * P(E_2 | E_1) * P(E_3|E_1 ∩ E_2) * … * P(E_n|∩…∩ E_n-1)