The complement of an event is the probability of:

The multiplication rule for independent events is:

The addition rule for mutually exclusive events is:

If events are mutually exclusive, the probability of either A or B occurring is given by:

Events A and B are independent if:

For mutually exclusive events, the probability of either event occurring is the sum of their individual probabilities.

The Law of Total Probability states that the probability of an event A is the sum of:

The probability of an event happening is always between:

If events A and B are independent, P(A∩B) is equal to:

If events A and B are mutually exclusive, P(A∩B) is: