用分别写有0,1,2,3的四张卡片,排成的三位数中,是奇数的概率为

问题描述:

用分别写有0,1,2,3的四张卡片,排成的三位数中,是奇数的概率为

能排成奇数的三位数有:301.321.213.231.201.203.123.103.
能排成的三位数有:321.301.310.312.320.302.230.203.210.201.213.231.120.130.102.103.123.132.
8/18=九分之四