Pure 3-dm Math modal:P(E)=13/72.The position in space is radom

来源: jinjing 于 2010-05-04 07:22:27 [] [旧帖] [给我悄悄话] 阅读数 : (158 bytes)

Good question,but 007 too 007.

P(E)=2/Pi[(1/Pi)ingrdx(from 0to1)intg(f)df(from 0toPi/3+
(1/2Pi)ingrdx(from 0to1)int(f)df(from 0toPi/3toPi/2)]=13/72.

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