Help with integrating the factorial function x!

[abia ubong]

hey i need help with this integral ,trhe function is x!,any help will be appreciated

 

[arildno]

The factorial is only defined on the natural numbers, as has been made abundantly clear to you in an earlier thread.
Stop posting this nonsense of yours and look up on the gamma function, as you have been advised about earlier.

 

[HallsofIvy]

You posted this same question yesterday and have received 16 responses to it. Have you read them? x! is only defined for integers and so does not have a Riemann integral. You could do it as a "Stieljes" integral: $$\int x! d\alpha(x)$$ where α(x) is the step function. In that case, the integral, from 1 to n, is the sum $$\Sigma_1^n x!$$.