Combination Calculator

Calculate combinations (nCr) - selections where order doesn't matter.

Total number of items to choose from
Number of items to select

Type

Each item can only be chosen once

10C3

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 ≠ ...

Documentation

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

Frequently Asked Questions
How to Use

About the Combination Calculator

What it calculates

This combination calculator solves mathematical and statistical problems using standard formulas. Calculate selections with or without repetition (nCr).

When to use it

Use for homework, data analysis, exam prep, or quick verification of manual calculations.

Example

Adjust the inputs above to model your specific scenario with the Combination Calculator.

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