2020年暑假期间,锦州有一新开发的景区在各大媒体循环播放广告,观众小宇首次看到该景区的广告后,不来此景区的概率为
,从第二次看到广告起,若前一次不来此景区,则这次来此景区的概率是
,若前一次来此景区,则这次来此景区的概率是
.记观众小宇第n次看到广告后不来此景区的概率为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ba5711dfbd33e558e0cebf8e1158b9.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ea895598d35e7c65d90e5e81ed5bac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33adb74906403b0b00fcbd9fa691d8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ba5711dfbd33e558e0cebf8e1158b9.png)
更新时间:2022-06-09 15:38:37
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【推荐1】设数列
的前
项和为
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,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78d551e6cc415f570dc7fc49b825cb1.png)
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解题方法
【推荐2】设
为数列
的前n项和,且
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______ .
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