Excludentes — P(A∪B)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The exclusive event probability calculator is a useful tool for calculating the probability of an event occurring, considering it is the union of two or more exclusive events. By using this calculator, you can determine the probability of a specific outcome occurring, considering the probabilities of each of the component events.
The underlying formula for this calculator is the sum of the probabilities of the individual events, P(A) + P(B). This applies when the events are mutually exclusive, i.e., they cannot occur at the same time. For example, if you are calculating the probability of raining or being a national holiday, these events are mutually exclusive and can be calculated separately.
This calculator is useful in various situations, especially in probability and statistics studies. Additionally, it is essential to consider common precautions when working with probabilities, such as avoiding calculation errors and ensuring that the probabilities are consistent with the available information.
Frequently asked questions
What is an exclusive event?
Exclusive events are those that cannot occur at the same time. For example, raining or not raining are exclusive events, since they cannot occur simultaneously.
How should I use this calculator?
Just enter the probabilities of the individual events and the calculator will calculate the probability of the union of the events.
What are the common precautions when working with probabilities?
Avoiding calculation errors and ensuring that the probabilities are consistent with the available information are fundamental precautions when working with probabilities.
Why can't I calculate the probability of two events occurring at the same time?
Because the events are exclusive and cannot occur simultaneously. If you want to calculate the probability of two events occurring at the same time, you need to use a different formula.
Can I use this calculator to calculate the probability of non-exclusive events?
No, this calculator is specific to exclusive events. If you need to calculate the probability of non-exclusive events, you need to use a different formula.