(1) 3 3 2
c (o.9) *(0.1) =0.0729
5
4 4
(2)最多一粒未发芽的概率 p=c (0.9) (0.1)=0.32805
至少有一粒未发芽的概率 p=1-p=1-0.32805 =0.67195