# Why does zero factorial equal one

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**1** (**zero factorial** is **equal** to **one**)? I have not found in any book by what procedure
the value of **zero factorial** occurs. If there is any mathematical proof in any book . Apr 28, 2014 **. ** Mathematical Proof of **zero factorial** is **1** .. **1** from first principles 15 answers. I
wanted. .. What **does** the factorial of a negative number signify? Jul 14, 2010 **. ** how to prove that 0! = **1**.. Proof: **Zero Factorial Equals One** x and y approach 0
you get a limit that **does** not exist which would seem to be but .

### why does zero factorial equal one

**The other three answers (by Ivan Wangsa, Arshdeep Singh, and Sridhar Ramesh
) are great and correct, I'd like to add a different take. A factorial is a functi. Jun 8, 2013 . Zero Factorial - Numberphile. . I read the thumbnail as "zero is not equal to one".
lol. . *1 then 0! does not even fit into the pattern. In mathematics, the factorial of a non-negative integer n, denoted by n!, is the
product of all positive integers less than or equal to n.. There is exactly one
permutation of zero objects (with. Why does 0! = 1? Is this like anything to the power of 0 equals 1? meaning of
factorial because you cannot multiply all the numbers from zero . So one logical thing is to say,; maybe zero factorial is zero. I'm just. So they can
define what it does.. We're just going to say zero factorial is equal to one.(read "Zero Factorial") is defined to equal 1. Involved answer(s):. If n! is defined
as the product of all positive integers from 1 to n, then: 1! = 1*1 = 1 2! = 1*2 = 2So an alternate way to think about the factorial is to let n be a natural number and say that n! is the number of permutations for a set with n elements.
Even though there is nothing to put in an order, there is one way to do this. Thus we have that 0! = 1. More » **

**In mathematics, the factorial of a non-negative integer n, denoted by n!, is the
product of all positive integers less than or equal to n.. There is exactly one
permutation of zero objects (with. Why does 0! = 1? Is this like anything to the power of 0 equals 1? meaning of
factorial because you cannot multiply all the numbers from zero . So one logical thing is to say,; maybe zero factorial is zero. I'm just. So they can
define what it does.. We're just going to say zero factorial is equal to one.(read "Zero Factorial") is defined to equal 1. Involved answer(s):. If n! is defined
as the product of all positive integers from 1 to n, then: 1! = 1*1 = 1 2! = 1*2 = 2So an alternate way to think about the factorial is to let n be a natural number and say that n! is the number of permutations for a set with n elements.
Even though there is nothing to put in an order, there is one way to do this. Thus we have that 0! = 1. More » **

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**Jul 14, 2010 . how to prove that 0! = 1.. Proof: Zero Factorial Equals One x and y approach 0
you get a limit that does not exist which would seem to be but . 1 (zero factorial is equal to one)? I have not found in any book by what procedure
the value of zero factorial occurs. If there is any mathematical proof in any book . Apr 28, 2014 . Mathematical Proof of zero factorial is 1 .. 1 from first principles 15 answers. I
wanted. .. What does the factorial of a negative number signify? The other three answers (by Ivan Wangsa, Arshdeep Singh, and Sridhar Ramesh
) are great and correct, I'd like to add a different take. A factorial is a functi. Jun 8, 2013 . Zero Factorial - Numberphile. . I read the thumbnail as "zero is not equal to one".
lol. . *1 then 0! does not even fit into the pattern. **