# Combinations

## #Combinations #Basics

Choose X from N is

$$ C_N^X = \frac{N!}{ X! (N-X)! } $$

Published:
by Lei Ma;

Lei Ma (2019). 'Combinations', Datumorphism, 04 April. Available at: https://datumorphism.leima.is/cards/math/combinations/.

## Table of Contents

**Current Ref:**

- cards/math/combinations.md