What will be the value of the following summation?
$$\sum_{i=1}^{m}{ \frac{i(n-i)!}{ n!} }$$
Is it $\frac{m}{2}$ ? Can anybody show the derivation?
What will be the value of the following summation?
$$\sum_{i=1}^{m}{ \frac{i(n-i)!}{ n!} }$$
Is it $\frac{m}{2}$ ? Can anybody show the derivation?