1. 

   math_celebrity Administrator Staff Member

   This is a symbol for a triple factorial.
   
   We have n!!! = n * (n - 3) * (n - 6) * ... * 1
   Our subtraction of 3 never goes below one.
   
   12!!! = 12 * 9 * 6 * 3
   
   
   

    

   math_celebrity, Dec 28, 2023

   #1
   
   

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