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数学知识普及:如果从36个符号中取20个的所构成的组合(不排序)有多少种?36C20=36!/(20!*16!)=7,307,872,110如果从36个符号中取20个的所构成的排列(排序)有多少种?36P20=36C20*20!=1.77793x10^28
真理党啊.™
字符是可以重复的,会有13367494538843734067838845976576种可能。
没错是36^20=13367494538843734067838845976576
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Reader Comments (Page 1 of 1)
Simon @ Nov 4th 2008 8:21AM
数学知识普及:
如果从36个符号中取20个的所构成的组合(不排序)有多少种?
36C20=36!/(20!*16!)=7,307,872,110
如果从36个符号中取20个的所构成的排列(排序)有多少种?
36P20=36C20*20!=1.77793x10^28
Satan_L5 @ Nov 4th 2008 8:29AM
真理党啊.™
Yujan @ Nov 4th 2008 8:32AM
字符是可以重复的,会有13367494538843734067838845976576种可能。
pepe @ Nov 6th 2008 11:33PM
没错是36^20=13367494538843734067838845976576