compound probability
problems that contain the words "and" or "or" without constructing a sample space.
or probability problem
requires obtaining a "successful" outcome for at least one of the given events.
Formula for finding the probability of event A or event B
P(A or B) = P(A) + P(B) - P(A and B)
mutually exclusive
Two events A and B are mutually exclusive IF it is impossible for both events to occur simultaneously.
and probability problem
requires obtaining a favorable outcome in each of the given events.
Formula for finding the probability of events A and B.
P(A and B) = P(A) x P(B)
independent events
if the occurrence of either event in no way affects the probability of occurrence of the other event.