your formula are good,but opperation is....

來源: 於 2010-07-04 15:07:20 [舊帖] [給我悄悄話] 本文已被閱讀：次

P(A1A2A5A2A5A3)+P(A1A2A5A2A4A3)+P(A1A2A5A3A4A3)+P(A5A2A5A3A4A3)=
1/16+1/32+1/16+1/16=6/32.
so,19/32 is right.
The best method was shown already by someone.