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OpenStudy (anonymous):
8+88+888......up to n=?
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OpenStudy (amistre64):
(10-2)+(100-12)+(1000-112)+.... hmm, not sure if that is simpler or not
OpenStudy (amistre64):
8 + 80+8 + 800+80+8+... thats better
OpenStudy (amistre64):
n 8s, n-1 80s, n-2 800s, n-3 8000s, etc
OpenStudy (amistre64):
if we factor out an 8 8(10^0(n-0)+10^1(n-1)+10^2(n-2)+...+10^n(n-n))
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