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#+title: factorial
#+author: Preston Pan
+#+description: combinatorial combinations of combining other combinations.
#+options: num:nil
-#+html_head: <link rel="stylesheet" type="text/css" href="../style.css" />
+
Introduction
The factorial [[id:b1f9aa55-5f1e-4865-8118-43e5e5dc7752][function]] $n!: \mathbb{N} \rightarrow \mathbb{N}$ describes the amount of ways one can arrange $n$ differentiable objects. In practice: