3C = 1+1/3+....+1/3^2016
2C = 3C-C = (1+1/3+...+1/3^2016) - (1/3+1/3^2+....+1/3^2017) = 1-1/3^1017
=>C = (1-1/3^2017)/2
3C = 1+1/3+....+1/3^2016
2C = 3C-C = (1+1/3+...+1/3^2016) - (1/3+1/3^2+....+1/3^2017) = 1-1/3^1017
=>C = (1-1/3^2017)/2
k mk nha
Dung roi do
Nhung cho minh hoi sao lai lay 3c,lam thi tra loi duoc chu