25 letters , it is not easy to do. I got this anwser in ten Mts.

來源: jinjing 於 2011-03-21 12:26:37 [] [舊帖] [給我悄悄話] 閱讀數 : (202 bytes)
回答: for 1) come on 可憐的 Jinjing....非整數, 由 guest007 於 2011-03-21 11:02:25

I think you can't solve the question about 25 letters. If a child can do it,(s)he would be genius.Please see my proof, it is not easy.We use symmetry and induction,it is not easy for most people.

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