Đáp án C
Xét khai triển 1 − x 2017 = C 2017 0 − C 2017 1 x + C 2017 2 x 2 − ... − 2 2017 C 2017 2017 x 2017 .
Cho x = 2 ta được C 2017 0 − 2 C 2017 1 + 4 C 2017 2 − 8 C 2017 3 + ... + 2 2016 C 2017 2016 − 2 2017 C 2017 2017 = − 1
Lại có C 2017 0 = 1 ⇒ S = 2 C 2017 0 − 2 C 2017 1 + 4 C 2017 2 − 8 C 2017 3 + ... + 2 2016 C 2017 2016 − 2 2017 C 2017 2017 = 0.