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【简答题】
(1)试验“袋子里放有5个不同的红球、6个不同的和10个不同的,从中任取一个球”中有__个基本事件。 (2)试验“袋子里放有5个不同的红球、6个不同的和10个不同的,从中任取两个球”中有__个基本事件。注意⚠️这里取出的两个球不考虑次序关系,但拿出的两个球可以排出两种不同的排列方式。 (3)(选做题,答案你们在群聊里回答)试验“袋子里放有5个不同的红球、6个不同的和10个不同的,从中任取三个球”中有??个基本事件。注意⚠️拿出三个球可以分三步完成任务)排出3*2*1=6种排列方式;当然,拿出四个球分四步完成排列)可以排成4*3*2*1=24种排列(方式)........。 要注意⚠️我们现在的问题是不考虑次序的,这种方案的一种可以变成与次序有关的排列?种。知道这关系,问题就可以解决了。
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举一反三
【单选题】There used to be a party on Saturday evenings in that school, ?
A.
was there
B.
used it
C.
didn’t there
D.
used there
【单选题】There used to be a tower here, ?
A.
usedn ’ t it
B.
used there
C.
didn ’ t it
D.
didn ’ t there
【单选题】There used to be a tall tree in front of our classroom, ____? [ ]
A.
used there
B.
didn't there
C.
wasn't there
【单选题】There used to be a coffee shop next to your house , ?
A.
wasn’t there
B.
didn’t there
C.
wasn’t it
D.
didn’t it
【简答题】There used to be a term that was used to describe someone who drove their vehicles down the highway while staring at the scenery. These drivers just drove slowly, taking their own sweet time, as if th...
【简答题】In the 19th century, there used to be a model of how to be a good person. There are all these torrents of passion flowing through you. Your job, as captain of your soul, is to erect dams to keep these...
相关题目：
【单选题】There used to be a tower here, ?
A.
usedn ’ t it
B.
used there
C.
didn ’ t it
D.
didn ’ t there
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