| A | B |
|---|
| The set of all possible outcomes of a probability experiment. | Sample space |
| The product of the natural numbers less than or equal to the number. | Factorial |
| An outcome or set of outcomes in a probability experiment. | Event |
| An arrangement of a group of objects in which order is important | Permutation |
| For n items, if there are m 1 ways to choose a first item, m 2 ways to choose a second item after the first item has been chosen, and so on, then there are m 1 ⋅ m 2 ⋅...⋅ m n ways to choose n items | Fundamental Counting Principle |
| A selection of a group of objects in which order is not important | Combination |
| The ratio of the number of equally likely outcomes in an event to the total number of possible outcomes | Theoretical probability |
| A number from 0 to 1 (or 0% to 100%) that describes how likely an event is to occur. | Probability |
| Outcomes that have the same probability of occurring. | Equally likely outcomes |
| The occurrence of one of several possible outcomes of a specified event or probability experiment. | Favorable outcomes |
| A possible result of a probability experiment. | Outcome |
| In probability, any activity based on chance. | Experiment |
| A method of calculating probability based on a geometric measure such as length or area. | Geometric probability |
| All outcomes in the sample space that are not in event A. | complement |
| The ratio of the number of times an event occurs to the number of trials, or times, that an activity is performed. | Experimental probability |
| In probability, a single repetition or observation of an experiment. | Trial |
| An event consisting of only one outcome. | Simple event |
| Events for which the occurrence or non-occurrence of one event affects the probability of the other event. | Dependent events |
| Events for which the occurrence or non-occurrence of one event does not affect the probability of the other event. | Independent events |
| An event made up of two or more simple events. | Compound event |
| The probability of event B, given that event A has already occurred or is certain to occur, denoted P(B|A). | Conditional probability |
