Probability Calculator
Calculate probability of events including union, intersection, and conditional probability.
How to Use This Calculator
Enter your values in the fields above and click "Calculate" to get instant results. This probability calculator provides accurate results with step-by-step explanations.
Formula
P(A∪B) = P(A) + P(B) - P(A∩B)
Quick Examples
- P(A)=0.6, P(B)=0.4 → P(A or B)=0.76
- P(A and B)=0.24 (if independent)
Frequently Asked Questions
What does "independent events" mean?
Two events are independent if the occurrence of one does not affect the probability of the other. P(A∩B) = P(A) x P(B).
What is conditional probability?
P(A|B) is the probability of A given that B has occurred. P(A|B) = P(A∩B) / P(B).