[問題] 一題機率
第4個選項我一直解不出來,
請求版上神人為我解答,
感激不盡
http://i.imgur.com/8NkQltj.jpg
![](https://i.imgur.com/8NkQltj.jpg)
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→
06/19 16:57, , 1F
06/19 16:57, 1F
![](https://i.imgur.com/JUKTv3G.jpg)
→
06/19 17:04, , 2F
06/19 17:04, 2F
→
06/19 17:05, , 3F
06/19 17:05, 3F
→
06/19 17:05, , 4F
06/19 17:05, 4F
推
06/20 15:45, , 5F
06/20 15:45, 5F
→
06/20 15:46, , 6F
06/20 15:46, 6F
→
06/20 15:46, , 7F
06/20 15:46, 7F
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