---
tag: 098PHYBTV9
kind: concept
name: Combination
msc: [05A05]
sources:
  - url: https://en.wikipedia.org/wiki/Combination
    locator: lead section
same_as:
  wikidata: Q202805
  wikipedia: Combination
---

## Summary

A combination is a selection of elements of a set in which the order does not matter. Combinations of size $k$ are the $k$-element subsets, and binomial coefficients count them. The node [[combination|0JZSRWRBZE]] gives the precise definition.