Combination: Any arrangement in which order is not important.

Factorial! n! represents the product of all the whole numbers from n to 1. n! is the product of all the whole numbers from n down to 1 - used in probability.

Favorable outcome: The desired results of an experiment in probability.

Outcomes: The possible results of a probability experiment

Permutation: Any arrangement in which order is important.

Probability: The possibility of an event to happen. The probability of getting an even number when rolling a 6 sided dice is 50%.

Sample Space: All possible ways an event may happen.

Theoretical Probability: The computation of the possibility that something will occur based on the number of possible outcomes.