You use step method is good,but ....

來源: jinjing 於 2010-04-01 16:35:25 [] [舊帖] [給我悄悄話] 閱讀數 : (172 bytes)

You only consider 4 steps,it is not enough and get 2/3,I don't understand,if you know the answer it is better think about 1-(1/3+1/9+1/27+.....)=1/3.I only verified

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