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关于题目中的说明?

Posted by zhangzhh05 at 2008-07-20 20:39:36 on Problem 1019 
For example, the first 80 digits of the sequence are as follows: 
11212312341234512345612345671234567812345678912345678910123456789101112345678910
这怎么会有80个呢，(11+1)*11/2+10=76   我理解错在什么地方呢？望高手指点。
谢谢
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