I guess you are trying to say:

来源: WQPY 于 2014-01-30 10:12:12 [] [博客] [旧帖] [给我悄悄话] 阅读数 : 0 (150 bytes)

1-0.9^10
But average ratio doesn't necessarily mean each is exact 10%.
Also such 10 are absolutely independent/正交 or some correlation?

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