TÍNH TỔNG S =1.C20181 +2.C20182 +3.C20183 +…+2018.C20182018A. S =2017...

Câu 44:

Tính tổng

S

=

1.

C

2018

1

+

2.

C

2018

2

+

3.

C

2018

3

+…+

2018.

C

2018

2018

A.

S

=

2017.2

2018

B.

S

=

2017.2

2017

C.

S

=

2018.2

2018

D.

S

=

2018.2

2017