Probability Calculator
Calculate P(A), P(B), P(A∩B), P(A∪B), conditional P(A|B), nCr, and nPr.
Set Probability
Combinations & Permutations
Probability Calculator
Calculate set probabilities (union, intersection, conditional) and combinatorics (nCr, nPr).
Features
- P(A∪B) using the inclusion-exclusion principle
- Conditional probability P(A|B) and P(B|A)
- Test for independence of events
- Combinations (nCr) and Permutations (nPr)
FAQ
What is nCr?
nCr is the number of combinations: ways to choose r items from n items without regard to order. Formula: n! / (r! × (n-r)!)
What is conditional probability?
P(A|B) is the probability of event A occurring given that event B has already occurred. Formula: P(A∩B) / P(B)