Apr 21, 2015 · Closed 12 years ago. Is there a notation for addition form of factorial? $$5! = 5\times4\times3\times2\times1$$ That's pretty obvious. But I'm wondering what I'd need to use …

Dec 28, 2015 · I have been looking at this problem for a long time. Can anyone prove the combination formula using factorials N choose K? In case anyone does not know how to list all …

Nov 24, 2015 · See de Polignac's formula. The number of trailing $0$'s in a number is the minimum of the exponents of $2$ and $5$ in its prime decomposition.

It is a valid question to extend the factorial, a function with natural numbers as argument, to larger domains, like real or complex numbers. The gamma function also showed up several times as …

Jun 29, 2015 · 12 I've been searching the internet for quite a while now to find anything useful that could help me to figure out how to calculate factorial of a certain number without using …

Approximating log of factorial Ask Question Asked 13 years, 7 months ago Modified 7 years, 6 months ago

Feb 22, 2016 · The factorial for non integers is called a continuation of the factorial for integers: we seek a function that obeys the known properties of the factorial, at all values of x.

May 15, 2018 · And we can and do simply define the double factorial as exactly that. But if you want to convert (for calculation purposes between factorial and double factorials that is the …

Sep 4, 2015 · However, there is a continuous variant of the factorial function called the Gamma function, for which you can take derivatives and evaluate the derivative at integer values.

Mar 29, 2018 · Say you picked the elements {1,2,3,...,r}. There are r! orders in which you could select this same set of elements out of a box of n elements.