How to calculate probability

Find the probability of a single random event

1. Choose an event whose results are mutually exclusive.
2. Defines all events and results that could occur.
3. Divide the number of events by the number of possible outcomes.
4. Add the probabilities of all possible events so that you make sure they are equal to 1.
5. Represents the probability of an impossible result with a 0.

Calculate the probability of various random events

1. Take care of each probability separately to calculate the independent events.
2. Consider the effect of previous events when calculating the probability of dependent events.
3. Multiply the probabilities of each event separated from each other.

Convert odds to probabilities

1. Set the odds as a proportion with the numerator being the positive result.
2. Add the numbers to convert the odds to probabilities.
3. Find the odds as if you were calculating the probability of a single event.