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A word consists of n letters from the alphabet {a,b,c,d}. Aword is called convoluted if it has two consecutive identical blocks of letters. For example, caab and cababdc are convoluted, but abcab is not. Prove that the number of non-convoluted words with n letters is greater than 2^n -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 218.167.197.47
chaogold:很困難歐 推 61.226.2.82 12/31
ouyangyii:完全沒想法啦....... 推 61.64.193.59 12/31
myflame:看不懂...完了英文有問題 推218.164.130.247 01/01
pikahacker:好玩ㄝ 推 218.164.138.23 01/01