嚴格求解:
{ P(30,6)*C(7,2) + P(30,5)*C(7,3) + P(30,4)*C(7,4) + P(30,3)*C(7,5) + P(30,2)*C(7,6) + P(30,1)*C(7,7) } / { P(30,7) + P(30,6)*C(7,2) + P(30,5)*C(7,3) + P(30,4)*C(7,4) + P(30,3)*C(7,5) + P(30,2)*C(7,6) + P(30,1)*C(7,7) }
把下列數字 copy&paste 到 https://www.suresome.com 的計算機(Real-Time Universal Calculator)中, 即得0.4833716386560448:
(30*29*28*27*26*25*7*6/2 + 30*29*28*27*26*7*6*5/3/2 + 30*29*28*27*7*6*5*4/4/3/2 + 30*29*28*7*6*5*4*3/5/4/3/2 + 30*29*7*6*5*4*3*2/6/5/4/3/2 + 30)/(30*29*28*27*26*25*24 + 30*29*28*27*26*25*7*6/2 + 30*29*28*27*26*7*6*5/3/2 + 30*29*28*27*7*6*5*4/4/3/2 + 30*29*28*7*6*5*4*3/5/4/3/2 + 30*29*7*6*5*4*3*2/6/5/4/3/2 + 30)
嚴格求解: 0.4833716386560448
所有跟帖:
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回複:嚴格求解: 0.4833716386560448
-jinjing-
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05/08/2010 postreply
14:55:07
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回複:回複:嚴格求解: 0.4833716386560448
-芷娞-
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05/08/2010 postreply
15:24:36
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You are right! I am a mathmatician and statistician
-noname100-
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05/14/2010 postreply
17:00:16