TỔNG S = C20182 C20184 C20186 ...C20182016C20182018 BẰNGA. 22016....
Câu 21: Tổng S =
C
2018
2
C
2018
4
C
2018
6
...
C
2018
2016
C
2018
2018
bằngA.2
2016
. B.2
2017
1
. C.2
2018
. D.2
1009
1
.C
2018
2
C
2018
4
C
2018
6
...
C
2018
2016
C
2018
2018
bằngA.2
2016
. B.2
2017
1
. C.2
2018
. D.2
1009
1
.