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Factorial Defined

"!" is the factorial symbol. N! means (N) × (n-1) × (n-2) ... × (n-n). 0! is defined to be equal 1.
Examples of factorials
  • 3! = 3 × 2 × 1 = 6
  • 4! = 4 × 3 × 2 × 1 = 24
  • 5! = 5 × 4 × 3 × 2 × 1 = 120

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