Question

8+88+888......up to n=?

Answer 1

(10-2)+(100-12)+(1000-112)+....

hmm, not sure if that is simpler or not

Answer 2

8 + 80+8 + 800+80+8+... thats better

Answer 3

n 8s, n-1 80s, n-2 800s, n-3 8000s, etc

Answer 4

if we factor out an 8

8(10^0(n-0)+10^1(n-1)+10^2(n-2)+...+10^n(n-n))