I think it is answer.

来源: 于 2010-06-18 17:29:48 [旧帖] [给我悄悄话] 本文已被阅读：次

1-1/4-1/8+1/32-1/32-1/32=19/32
p2,p3 bad: 1/4
p1,p4,p5 bad: 1/8
all bad:1/32
p1 bad ,p2 good,p5 bad,p3bad,p4 good:1/32
p2 bad ,p1 good,p5 bad,p3 good,p4 bad:1/32