4.3 Addition Rule & Conditional Probability

∪

a mathematical symbol that represents the union of sets; it also represents “or”

conditional probability

a probability that takes into account a given condition

P(B|A) = (P(A∩B)) / (P(A))

the formula for conditional probability

general addition rule

a rule for finding the probability of event A or event B when the events are not mutually exclusive

(A∪B)= P(A)+P(B)−P(A∩B)

the formula for the general addition rule

∩

a mathematical symbol that represents the intersection of sets; it also represents “and”

venn diagram

a figure with one or more circles inside a rectangle - the rectangle represents the sample space of an experiment, and the circles represent events

A^C

the notation for the complement of event A