C20182017+C20182018A

Câu 27 :

Tính tổng:

S

=

2 .

2018

C

2018

0

2 .

2017

C

1

2018

+

2 .

2016

C

2018

2

− −

... 2.

C

2018

2017

+

C

2018

2018

A.

S

=

2

2018

1

B.

S

=

3

2018

C.

S

= −

1

D.

S

=

1