| A | B |
|---|
| actual odds against | the ratio P(not A)/P(A), usually expressed in the form of a:b |
| actual odds in favor | the ratio P(A)/P(not A), usually expressed in the form of b:a |
| addition rule | P(A or B) = P(A) + P(B) - P(both) |
| combinations rule | rule for determining the number of different combinations of items selected |
| complement | all outcomes in which the original event does not occur |
| compound event | combination of simple events |
| conditional probability | the probability of an event, given some other event has occurred |
| counting rule | M*N ways to select one item out of M items and a 2nd out of N |
| dependent event | the occurrence of any one event affects the probability of the others |
| factorial rule | n different items can be arranged n! different ways |
| independent events | one event occurring doesn't affect the probability of the other occurring |
| multiplication rule | P(A and B) = P(A)*P(B) |
| mutually exclusive | events that cannot occur simultaneously |
| permutations rule | rule for determining the number of different arrangements of items selected |
| random sample | every member of the population has the same chance of being chosen |
| sample space | set of all possible outcomes or events in an experiment |
| simple event | an outcome that cannot be further broken down |
