Math 2.0

Concept

Rule of division (combinatorics)

Summary

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

Further reading

  1. Wikipedia, page 63848545, revision 1080065682, Rule of division (combinatorics). adopted
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