Question

S=1+2+4+14+21+28+...+2016
Urgent!!!

Answer 1

$S = 1 +2+4+14+21+28+...+2016 \\ S = 7+14+21+28+...+2016 \\ S = 7 \cdot(1+2+3+4+...+288) \\ \\ S = 7\cdot \frac{288\cdot(288+1)}{2} \Rightarrow S = 7 \cdot 144\cdot 289 \Rightarrow S = 291.312$