With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

No credit card required

We use the addition rule of probabilities to calculate the probability of the union of events—that is, the probability that either Event A or Event B will occur. For two events that are mutually exclusive, the addition rule states the following:
P[A or B] = P[A] + P[B]
As an example, for the single-die experiment with mutually exclusive events:
◆ Event A: Roll a 1.
◆ Event B: Roll a 2.
def•i•ni•tion
For mutually exclusive events, the addition rule states that P[A or B] = P[A] + P[B]. If the events are not mutually exclusive, the addition rule becomes P[A or B] = P[A] + P[B] - P[A and B].
The simple probabilities are as follows:
and
The probability that either a 1 or a 2 will be rolled ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

No credit card required