減小法可幫人查公式對否,2男,1女取2人,1男以上的概率...
[C(20,6)C(18,4)+C(20,7)C(18,3)+...+C(20,9)C(18,1)+C(20,10)]/C(38
所有跟帖:
• [C(20,6)C(18,4)+...+C(20,9)C(18,1)+C(20,10)]/C(38,10) -jinjing- ♀ (0 bytes) () 10/21/2011 postreply 09:07:14
• [C(20,6)C(18,4)+...+C(20,9)C(18,1)+C(20,10)]/C(38,10) -jinjing- ♀ (0 bytes) () 10/21/2011 postreply 09:07:14
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