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53.1%
twfx
2010-04-23 12:55:08
( reads)
1-P(30,7)/30^7=53.1%
跟帖(3)
jinjing
2010-04-23 13:22:21
P(30,6)*C(7,2)/30^7=0.410511111,I use 5 people carelessly.
cheerleaders
2010-04-23 17:13:05
agree~~~
PLMM
2010-04-27 18:36:58
3，4%
jinjing
2010-04-23 13:22:21P(30,6)*C(7,2)/30^7=0.410511111,I use 5 people carelessly.