I am unsure of how Wolfram Alpha computes the following partial sum:
sum of (n-k)!/(n-r-k)! from 1 to n-r - Wolfram|Alpha
If someone could explain to me how the equation for the partial sum is derived I'd greatly appreciate it. Thanks!
I am unsure of how Wolfram Alpha computes the following partial sum:
sum of (n-k)!/(n-r-k)! from 1 to n-r - Wolfram|Alpha
If someone could explain to me how the equation for the partial sum is derived I'd greatly appreciate it. Thanks!