[解題] 機率
1.年級:高一
2.科目:數學
3.章節:機率
4.題目:
因為有圖,所以用圖片表示。
第一題:(水平線後來才知道是學生自己畫的,連中間代號也是,有PS過了)
http://ppt.cc/e~NM
第二題
http://ppt.cc/AXdE
5.想法:
除了I之外,其他點任何人到達都是1/9
所以在I以外的點相遇都是1/81,共六個點,6/81
I相遇的機率是1/3*1/3=1/9
所以應該是5/27吧?
可是答案是11/54
第二題我第一小題有問題,選每條捷徑的機率都相同
那不是應該是5條(分母為5)
可是答案是5/16
以上問題請教大家,謝謝^^
讓我很納悶
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