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    		h1>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
    Related Links: multiplication counting principle
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