(In reply to
re: Is this valid? no !  partial spoiler by Ady TZIDON)
I was surprised the answer was 2 myself since it's the same as the 2^n series, but I looked it up.
However they switch termwise with the triangular numbers reciprocals first smaller then larger than the geometric.
I know that regrouping terms doesn't always work as
(1+1)+(1+1)+...≠1+(1+1)+(1+1)...
but since I got the correct answer I want to know if I was somehow "cheating."

Posted by Jer
on 20150220 21:19:34 