Combination Calculator
Calculate combinations (nCr) - selections where order doesn't matter.
Type
Each item can only be chosen once
0
nCr
10C3
0 ways
nPr (for comparison)
10P3
0 arrangements
Ratio P/C
—
= r! = 6
Combination vs Permutation
Combinations (Order ✗)
0
ABC = ACB = BAC = ...
Permutations (Order ✓)
0
ABC ≠ ACB ≠ BAC ≠ ...
Understanding Combinations
Combinations count the number of ways to select r items from n items when order doesn't matter. It's the number of subsets of size r.
Without Rep
With Rep
Symmetry
About the Combination Calculator
This combination calculator solves mathematical and statistical problems using standard formulas. Calculate selections with or without repetition (nCr).
Use for homework, data analysis, exam prep, or quick verification of manual calculations.
Adjust the inputs above to model your specific scenario with the Combination Calculator.
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