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11、一个有200人的小组中,选P的有125人,选S的有81人,求既不选P也不选S的人有多少?
(1)选S的人中有20%的人选了P;
(2)选P的人中有56人没有选S;
【答案】D
【思路】I=p+s-ps+非p非s(I代表全集), 所以只要求出ps即可!(1)和(2)分别可以求出即选了p又选了s的人数。所以答案是D
12、6本书中有2本是历史书,6本书在书架上直线排列,其中两本历史书要在其他书的左侧的排法有多少种?
【答案】48
【思路】将书分为两部分:其他4本书,和2本历史书
先排4本书P
再排2本书P
因为要求2本书放在4本书的左侧,则两部分的顺序给定,不用考虑了!
所以PP=48
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