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Why is 0 factorial equal to 1?

 #1
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Here's an informal proof.......notice that :

 

3!   =  4!/4

2!  =   3!/3

1!  =   2!/2

 

Which implies that :

 

0!  = 1! / 1   =   1/1    = 1

 

 

cool cool cool

 May 1, 2016

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