剛剛在算衝10%的機率 - 楓之谷

By Una
at 2006-03-08T21:20
at 2006-03-08T21:20
Table of Contents
衝10%捲----> 桑拿服
C10取0(也就是都沒過)的次數1
C10取1(10次中了1次 )的次數10
C10取2.........2....的次數45
C10取3.........3....的次數120
C10取4.........4....的次數210
C10取5.........5....的次數252
C10取6.........6....的次數210
C10取7.........7....的次數120
C10取8.........8....的次數45
C10取9.........9....的次數10
C10取10.......10....的次數1
那假設要中一次 應該就是 10(次數) * (0.1) = 1 (100%的機率)
假設要中兩次 應該就是 45 * (0.1*0.1) =0.45 ( 45%的機率)
假設要中三次 就是 120 * (0.1*0.1*0.1) =0.12 (12%的機率)
如果要中四次 就是 210 * (0.1*0.1*0.1*0.1) =0.021 (2.1%的機率)
有高手可以幫我解答一下
請問是這樣推論的嗎?? 這樣看來+4張10%的桑拿很難衝出來!!!!(果真是神裝)
--
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