✔ 最佳答案
26x25x24x23x22x21x20x19x18x17x16x15x14x13=841941782922240000
because 第一:A-Z 26個x第二:A-Y 25個x...24個x...23個x...22個x...13個
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2008-12-17 21:57:31 補充:
如___ 用1,2,3組成 有123,132,213,231,312,321 6組=3x2x1=6
如____用1,2,3,4組成 有1234,1243,1324,1342,1423,1432,2134,2143,2314,2341,2413,
2431,3124,3142,3214,3241,3412,3421,4123,4132,4213,4231,4312,4321=4x3x2x1=24
參考: P.5 teacher teach, P.5 teacher teach