Mathh

• Probability - branch of mathematics concerned with analyzing the chance that a particular event will occur. Its purpose is to attempt to predict the likelihood that something will or will not happen.
• Certain - an event will happen without a doubt; sure; unquestionable.
• Impossible - an event that cannot happen,
• Possible - able to be done; capable of becoming true or actually happening.
• Sample Space (S) - set of all the possible outcomes in one probability experiment
• n(S) - total number of the possible outcomes.
• Probability of an Event - The ratio of the number of ways an event can occur to the number of possible outcomes.
• Favorable Outcomes - The outcome that you are looking for in a probability experiment/event. 
• Always reduce your answers in lowest term
• Outcome - each possible result of a probability experiment
• Fundamental Counting Principle (FCP) - states that if one event can occur in n1 ways and a second event can occur in n2 ways, and a third in n3 ways, and so on, then these events can occur in n1  x n2 x n3 x … ways.
• Tree Diagram - Device used to list all possibilities of a sequence of events in a systematic way.