You are right, they are comman things, 10m included in 1h,

来源: jinjing 于 2011-01-30 20:59:44 [] [旧帖] [给我悄悄话] 阅读数 : (363 bytes)
回答: 回复：1 - (0.1)^(1/6) 由 zeal626 于 2011-01-30 00:37:20

We have P(E)<=P(F),if E is subset of F. So,Bu's answer is not right. But I can construct a Q let his answer almost is right.There are 6 period,every period one star shows up,seen by a man, the prob. is the same,the Prob. seen all stars by man is .9,What is the Prob. a star seen by man in the first period?

The answer is .98...near to 1-.1(1/6).

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• Sorry, I miss ^By *. -jinjing- ♀ 给 jinjing 发送悄悄话 (0 bytes) () 01/31/2011 postreply 08:26:11

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