Combination Calculator
Combination Calculator
Combination Calculator
Calculate C(n,r) — combinations and permutations
Calculate number of ways to choose r items from n items where order doesn't matter. Essential for combinatorics.
Key Features
Combination calculation
Permutation display
Both results
Formula comparison
Clear explanations
Side-by-side comparison
How to Use This Tool
Enter total items (n)
Enter total items (n)
Enter items to choose (r)
Enter items to choose (r)
Click Calculate Combinations
Click Calculate Combinations
View both results
View both results
Understand the difference
Understand the difference
Use Cases
Choosing teams/groups
Combinatorics problems
Lottery calculations
Menu combinations
Probability calculations
Frequently Asked Questions
What is combination?
Order doesn't matter choice
Formula?
C(n,r) = n!/(r!×(n-r)!)
Can r be 0?
No, must choose at least 1
Combination vs Permutation?
C is larger
Tool Information
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