• Factorial
  A number factorial means to multiply that number by all the whole numbers below it. It is written with a exclamation (!) mark after it, like this: 5!, and means:
  5! = 5 x 4 x 3 x 2 x 1 = 120
  6! = 6 x 5 x 4 x 3 x 2 x 1 = 720
  Now here is a question for you:
  What is 4!?
  

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