For n,it seems (n-1)th equition should be delt with.

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really wonderful. there are no (n-1)th equition . -皆兄弟也- 给 皆兄弟也 发送悄悄话 皆兄弟也 的博客首页 (259 bytes) () 09/14/2010 postreply 10:43:52

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