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Originally posted by pengyehui at 2011-05-01 11:42:38:
P(N<=4)=P(N=0)+P(N=1)+...+P(N=4)¡¡¶ø

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math105(½ð±Ò+1): »¶Ó­²ÎÓëÌÖÂÛÎÊÌâ 2011-05-01 22:06:31
P(N<=4)=P(N=0)+P(N=1)+...+P(N=4)¡¡¶ø

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hzsh2009(½ð±Ò+3): 2011-05-04 02:15:15
math105(½ð±Ò+1): лл²ÎÓëÌÖÂÛ 2011-05-04 11:36:44
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