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[数列] 数列小题一道

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guanmo1 Posted 2014-1-24 09:04 |Read mode

如图

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186 Threads	206 Posts	2150 Credits

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Author| guanmo1 Posted 2014-1-24 11:10

想通了，首先必有n≤5，再讨论知，n=5时，删除的必须是第三项，计算知不可能，于是，n=4，就好办了。

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