送交者: LaoXiao 于 2010-01-21, 19:26:19:
回答: JFF的BASIC好像被人笑话了?那就拿EXCEL (2007)来模拟吧: 由 Amsel 于 2010-01-21, 15:55:37:
Let N be the number of "字母" can be used for surname, the probability is
P(N) = [ n^3 + 6*n^2 + 11*n + 6 ] / [ 24*n^3 ]
P(26) = 0.05197
P(N) --> 1/24 when N --> infinite.