• Sample space is a set of all possible outcomes of an experiment.
• It is represented with the letter \(S\).

• A tree diagram can be used to show the flow of the process.
• It is used to organise and calculate the probability of an event happening.

• The number of possible outcomes is represented by \(n(S)\) .
• The number of events is represented by \(n(A)\).
• The probability of an event \(A\) is \(P(A)\).

Then, the probability of an event \(A\) is represented by 

\(P(A) = \dfrac{n(A)}{n(S)}.\)