Probability Formulas

1. Outcomes are not likely equal

1.1. Relative Frequency

1.1.1. P(A)=number of times A occurred     divided by number of times the procedure was repeated

2. Requires equally likely outcomes

2.1. Classical Approach

2.1.1. P(A)= number of ways A can occur divided by number of different simple events = s/n

3. Educated guess

3.1. Subjective Probabiity

3.1.1. general knowledge