TỔNG S =32020C20200 −32019C20201 +32018C20202 − +... 30C202020...

Câu 29. Tổng

S

=

3

2020

C

2020

0

3

2019

C

2020

1

+

3

2018

C

2020

2

− +

... 3

0

C

2020

2020

bằng A. 4 .

2020

B. −2 .

2020

C. 2 .

2020

D. −4 .

2020