抽水 should be 0.086 = 8.6%
For you bet $1000, X is the amount you get back for any result, then (1000 - X) is 抽水.
When you bet as follow:
主win 1.95 : $468.66
Then you will get back $913.89 for any result.
and $86.10 is the amount of 抽水 作者: 龍一 時間: 2010-9-6 23:43