---
tag: 9VADDT7THK
kind: concept
name: Rule of division (combinatorics)
sources:
  - wikipedia: en:63848545@r1080065682
    locator: Rule of division (combinatorics)
    note: adopted
    mention: wikipedia://en/63848545
    sections: [Summary]
same_as:
  wikidata: Q96403087
  wikipedia: Rule of division (combinatorics)
inventory: [1A2M8K6Q2J]
---

## Summary

In [[combinatorics|0JKW7W7XFR]], the **rule of division** is a counting principle. It states that there are $n/d$ ways to do a task if it can be done using a procedure that can be carried out in $n$ ways, and for each way $w$, exactly $d$ of the $n$ ways correspond to the way $w$. In a nutshell, the division rule is a common way to ignore "unimportant" differences when counting things.