一道简单的英语数学概率题A number is chosen randomly from all of the 2- digit integers,find the probability that the units of the number is 3.A.1/89B.4/45c.1/10D.9/892- digit integers,

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一道简单的英语数学概率题A number is chosen randomly from all of the 2- digit integers,find the probability that the units of the number is 3.A.1/89B.4/45c.1/10D.9/892- digit integers,

一道简单的英语数学概率题A number is chosen randomly from all of the 2- digit integers,find the probability that the units of the number is 3.A.1/89B.4/45c.1/10D.9/892- digit integers,
一道简单的英语数学概率题
A number is chosen randomly from all of the 2- digit integers,find the probability that the units of the number is 3.
A.1/89
B.4/45
c.1/10
D.9/89
2- digit integers,

一道简单的英语数学概率题A number is chosen randomly from all of the 2- digit integers,find the probability that the units of the number is 3.A.1/89B.4/45c.1/10D.9/892- digit integers,
不是吧.是随机选一个2位数,个位是3的几率是多少?
9/90 = 1/10

随机选取一个两位数,这个两位数的两个数字之和是3的可能性是多少?
这个两位数只有可能是12或者21或者30,所以可能性是3/90,即1/30

。。。