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Aa zz - PowerPoint PPT Presentation

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???. 130321033 ??? 2014-05-09. ????. ?????. ?????????. A~Z ??? 26 ????????????? C(1,26) ??? AA~ZZ ?? C(2,26)=26*25/2!=325 BCD~BYZ ?? C(2,26-2)=24*23/2!=276 ABD=(A~Z)+(AB~YZ)+(D-B)=26+325+2 EGH=(A~Z)+(AB~YZ)+(ABC~AYZ)+(BCD~BYZ)+(CDE~CYZ)+(EFG~EFZ)+(G~H). ??????????. 1 ????? n ?????

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Aa zz - PowerPoint PPT Presentation

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