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0 Factorial?

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1. Why is 0 factorial 1?
2. Because mathematicians say so.
To be less facetious, it is simply convention that the empty set can only be "arranged" in one way.
3. (Original post by HeenaChowdry)
Why is 0 factorial 1?
represents the number of ways to order a set of objects. How many ways are there to order a set of no objects?
4. If 3! = 3x2x1, 2! = 3!/3, 1!=2!/2, 0!=1!/1 = 1

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Updated: May 25, 2016
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