25%
30%
28%
38%
40%
参考答案:
1.解:首先考虑总的可能性为,再考虑A在1,B在2,C在3的可能性分别为,中重复计算了三者交集,分别为AB在1,2,AC在1,3,BC在2,3,所需将三种情况加回,即,但考虑这三种加回的交集又重复计算了ABC在1,2,3的情况,所以应减去P33
2.解:在平面直角坐标系中,T
3.解:设总数为x,设incorrect paper record有y, incorrect electric record有z,则:
xy60%=3%x y=5%
xz75%=3%x z=4%
则,两者至少有一个错误的百分比为5%+4%-3%=6%,所正确答案为94%
4.解:1/20+1/30=1,得出x=1.25
5.解:划出图表来可以一目了然:A, B均不发生的最大概率为40%,最小概率为0.
6.解:A和B的并集为:54%+48%-30%=72%,所C为28%.
Set
A set is a collection of objects or things. Each object in a set a member or element of that set.Size of a set is the number of members in the set.
Example:
The set of even numbers between 2 and 10 is of size 5:{2,4,6,8,10}.
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