- #1
MarkFL
Gold Member
MHB
- 13,288
- 12
Please compute the following sum:
\(\displaystyle S_n=\sum_{k=1}^{n}\frac{n!}{(k-1)!(n-k)!}\)
\(\displaystyle S_n=\sum_{k=1}^{n}\frac{n!}{(k-1)!(n-k)!}\)