permutation
an arrangement of items or events in which order is important.

independent events
events for which the outcome of one even does not affect the probability of the other.

dependent events
events for which the outcome of the first event affects the probability of the second event.

combination
an arrangement of items or events in which the order does not matter.

factorial
the product of all whole numbers except zero that are less or equal to the number.

event
an outcome or set of outcomes of an experiment or situation.

probability
a number from 0 to 1 (or 0% to 100%) that describes how likely an event is to occur.

trial
in probability, a single repetition or observation of an experiment.

outcome
a possible result of a probability experiment.

experiment
in probability, an activity based on chance, such as tossing a coin.

complement
the set of all outcomes that are not the desired event.

experimental probability
the ratio of the number of times an event occurs to the total number of trials, or times that the activity is performed.

sample space
all possible outcomes of an experiment.

Fundamental Counting Principle
If one event has "m" possible outcomes and a second event has "n" possible outcomes after the first even has occurred, then there are "m*n" total possible outcomes for the two events.

theoretical probability
the ratio of the number of equally likely outcomes in an event to the total number of possible outcomes.

prediction
something you can reasonably expect to happen in the future.

fair
when all outcomes of an experiment are equally likely.

equally likely
outcomes that have the same probability.

simple event
an event consisting of only one outcome.

compound event
an even made up of two or more simple events.

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