Factorials

A Factorial is an AWESOME mathematics notation that makes multiplying common things in counting easy to write:

\[n!=n\cdot(n-1)\cdot(n-2)\cdot(n-3)\cdot\cdot\cdot 2\cdot 1\]

Example(s):

  • \(2!=2\cdot 1=2\)
  • \(3!=3\cdot 2\cdot 1=6\)
  • \(4!=4\cdot 3\cdot 2\cdot1=24\)

A little thing we in the mathematics community made up is:

\(0!=1\)