A蠍一 6覈 4覈 襦 蟲焔 10覈 讌る覿 3覈 覦螻 . x 螻 手 . 蠍一 x 蠏螻 覿 蟲.
- 豐讌 N = 10, n = 3, 煙 a = 4
- 蠏(蠍磯螳) = n(a/N) = 3 * 4 / 10 = 1.2
- 覿 = n(a/N)(b/N)(N-n)/(N-1) = 3 * 4/10 * (10-4)/10 * (10-3)/(10-1) = 0.748
譬襭螳^^ -- 伎蠏 2012-04-06 21:27:53
譬 襭 螳 :) -- 蟾 2013-11-11 21:32:22