Tính $S= \sum_{k=1}^{n} \frac{(-1)^{k}kC_{n}^{k}}{(k+1)(k+2)}$
Tính $S= \sum_{k=1}^{n} \frac{(-1)^{k}kC_{n}^{k}}{(k+1)(k+2)}$
Started By hieu31320001, 12-02-2018 - 00:40
#1
Posted 12-02-2018 - 00:40
hieu31320001
-
- Thành viên
-
- 121 posts
Trung sĩ
Knowing both victory and defeat.That is the way you become a real man-Shanks
1 user(s) are reading this topic
0 members, 1 guests, 0 anonymous users
