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Nice Proof of a Geometric Progression Sum | SputSoft
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StartupNews: Nice Proof of a Geometric Progression Sum http://bit.ly/RxPXT
Another elegant visual proof of a geometric sum: http://sputsoft.com/archives/25 (via Hacker News). This one is also in Roger Nelson's PwoW.
Nice proof of a geometric progression sum - proving 1+r+r^2+... = 1/(1-r) by considering a simple figure http://tinyurl.com/lv2ow5 #math