Tổng \(S = \frac{1}{{2017}}(2.{\mkern 1mu} 3C_{201...

Câu hỏi: Tổng \(S = \frac{1}{{2017}}(2.{\mkern 1mu} 3C_{2017}^2 + 3.{\mkern 1mu} {3^2}C_{2017}^3 + 4.{\mkern 1mu} {3^3}C_{2017}^4 + ...\)\( + k.{\mkern 1mu} {3^{k - 1}}C_{2017}^k + ... + 2017.{\mkern 1mu} {3^{2016}}C_{2017}^{2017})\) bằng

A

 \({{4}^{2016}}-1.\)               

B

\({{3}^{2016}}-1.\)                

C

 \({{3}^{2016}}.\)                  

D  \({{4}^{2016}}.\)