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解题方法
1 . 一只不透明的口袋内装有9张卡片,上面分别标有1~9这9个数字(1张卡片上标1个数),“从中任抽取1张卡片,结果卡片号或为1或为4或为7”记为事件
,“从中任抽取1张卡片,结果卡片号小于7”记为事件
,“从中任抽取1张卡片,结果卡片号大于7”记为事件
.下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.事件![]() ![]() | B.事件![]() ![]() |
C.事件![]() ![]() | D.![]() |
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2022-06-28更新
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509次组卷
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3卷引用:江苏省常州市溧阳市2021-2022学年高一下学期期末数学试题
江苏省常州市溧阳市2021-2022学年高一下学期期末数学试题(已下线)期末考试仿真模拟试卷04-(苏教版2019必修第二册)江苏省江阴市华士高级中学2023-2024学年高一下学期5月学情调研数学试题
解题方法
2 . 在一次抛硬币游戏中,甲乙两人依次抛掷,每次抛掷出现正面向上和反面向上的概率都是
.甲先抛,若抛掷正面向上记1分,抛掷反面向上记-1分.设甲抛掷的得分记为数列
,乙抛掷的得分记为数列
,数列
,
的前
项和分别为
和
.
(1)求满足“
”的事件
的概率.
(2)求满足“
,且
”的事件
的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(1)求满足“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f923cac02ccaf0c6255d74e5b8111d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)求满足“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0884c2d3e9c40914b3eda0464a425380.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4864b8fd7d244dea22df0aa6ad3a00c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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