TỔNG  2017 2 2 2017 3 3 2017 4 1 2017 2016 2017 2017 S  C  C ...

Câu 33: Tổng  2017 2 2 2017 3 3 2017 4 1 2017 2016 2017 2017

SCCC   k C   C

2017

bằng

A. 4 2016  1 . B. 3 2016  1 . C. 3 2016 . D. 4 2016 .