worldofcalcsProbability Calculator 🎲
Combinations (nCr)
Order doesn't matter
120
Permutations (nPr)
Order matters
720
Factorial (n!)
n × (n-1) × ... × 1
3,628,800
About Probability Calculator
Calculate permutations and combinations to determine the number of possible outcomes. Essential for statistics and probability theory.
Features
- Combinations (nCr) - Selection without order.
- Permutations (nPr) - Arrangement with order.
- Factorial (n!) calculation.
- Large number support.
How to Use
- Enter total items (n).
- Enter items to select (r).
- Results update automatically.
Formulas
- nCr = nCr = n! / (r! × (n-r)!) - Choosing r from n
- nPr = nPr = n! / (n-r)! - Arranging r from n
- n! = n! = n × (n-1) × (n-2) × ... × 1