Here's the question you clicked on:
apple_pi
The factorial function '!' of n means: 1 x 2 x 3 x ... x n Is there an inverse function of this? So like if I take 6227020800, it will give me 13
better to see other opinions
Also there is a graph of the function: http://www.wolframalpha.com/input/?i=x%21 How is, say 1.5! computed?
! means permutation or factorial
are u familiar with gamma function?
I think:|dw:1345023879967:dw|then|dw:1345024066726:dw|where x is the largest possible number such that |dw:1345024016129:dw|
@sauravshakya a small mistake f^-1(n) must be equal to f(n)/(1.2.3.....(x-n)).