回複：Wrong:P(a^bd^cd)=.336

來源: 於 2010-01-30 07:51:42 [舊帖] [給我悄悄話] 本文已被閱讀：次

P(a^bd^cd)=.35*.3+(.3*.5+.7*.5)*(.3/(1-.35))=.336 wrong.
It should be:P(a^bd^cd)=.35*.3+.3*(.15/(1-.35))+.5(.3/(1-.35))=.405