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1 factorial is equal to 1?

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In general, take any natural number n. We can find n factorial by multiplying n by each natural number that is less than n. So 4! is 4x3x2x1.
In the case of 1! it is just 1 since there are no natural numbers less than 1.
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Why factorial of 0 equals 1?

Zero factorial is one because n! = n-1! X n. For example: 4! = (4-1) X 4. If zero factorial was zero, that would mean 1! =(1-1) X 1 = 0 X 1=0. Then if 1!=0, then even 999! wou

What is 1 factorial?

1 factorial = 1

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How is 0 factorial equals 1?

The simple answer is that it is defined to be 1. But there is reason behind the decision. As you know, the factorial of a number (n) is equal to: n! = n * (n-1) * (n-2) ...

Why the factorial of 0 is 1?

Partly convention. It helps to maintain the identity N! = N*(N-1)! for N = 1. The convention also maintains consistency with the definition of the Gamma function.

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Well, 0! (the mathematical sign for "factora") is actually 0 itself. ... So that leads us to the question "Is 1 equal to 0?" Although many people have tried to make proof th

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