Is always between 0 and 1. It is the chance an event will occur.
The probability of an event considers the number of occurances of an event relative to the number of possible outcomes.
Random Experiment
In probability theory, can be defined as a trial that is repeated multiple times in order to get a well-defined set of possible outcomes. (Examples are: rock paper scissors, roulettes, deck of cards. etc..)
Sample Space (S)
can be defined as the set of all possible outcomes that result from conducting a random experiment. For example, the sample space of tossing a fair coin is heads or tails.
Event (E)
The set of outcomes of an experiment that forms a subset of the sample space.
Ways in counting the number of occurrence
Systematic listing, Tree diagram, Table, and Fundamental counting principle
