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** ** ** defined ** *** product of *** ******** ******** **** * ** * then:
1! * *** = 1
2! * 1*2 = **
** * ***** * **
4! * ******* = ***
**
* ********************* ***
** on *********
** can also ** ********* ******** ********* **
n=1
***** ** = n*(n-1)! ** = *****
***** simplifies **
* * **