P(2)=6*4/56=3/7.
P(K)=C(n,k)*C(N-n,m-k)/C(N,m), N=8, n=4, m=3, k=2
所有跟帖:
• 給 Jinjing 三克油! -小鬼剔牙- ♀ (0 bytes) () 11/30/2011 postreply 15:39:38
• 給 Jinjing 三克油! -小鬼剔牙- ♀ (0 bytes) () 11/30/2011 postreply 15:39:38
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