Combinations & Permutations
Calculate the number of combinations (nCr) and permutations (nPr) for probability and counting problems.
How to Use the Combinations & Permutations
- 1
Enter n (total items)
Input the total number of items in the set.
- 2
Enter r (items chosen)
Input how many items you are selecting.
- 3
Choose type
Select combination (order irrelevant) or permutation (order matters).
- 4
View result
See the number of possible combinations or permutations.
💡 Tips & Tricks
- •Ask yourself: "Does the order of selection matter?" If yes, use permutations.
- •Lottery calculations use combinations (order of drawn numbers does not matter).
- •Password/PIN calculations use permutations (order matters).
Frequently Asked Questions
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