機率的兩個問題 - 考試

By Jessica
at 2014-07-22T17:22
at 2014-07-22T17:22
Table of Contents
問題一:
Q1: A.B.C 三人依序丟擲一個骰子,第一位擲到6點者,就是嬴者。
第一輪就有人贏的機率為?
我的想法如下
http://ppt.cc/ccOy
三人中先選一人,擲出6(機率為1/6);
另外二人就不用再選了,擲出1~5點(機率為(5/6)^2 )
我的算法會等於75/216
但是答案為91/216 為何?
--------------------------------------------------------------
Q2: 題目如下
http://ppt.cc/vjZo
我試著用文氏圖去理解 但還是想不出B錯在哪
http://ppt.cc/OUwS
以上 謝謝
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Q1: A.B.C 三人依序丟擲一個骰子,第一位擲到6點者,就是嬴者。
第一輪就有人贏的機率為?
我的想法如下
http://ppt.cc/ccOy
三人中先選一人,擲出6(機率為1/6);
另外二人就不用再選了,擲出1~5點(機率為(5/6)^2 )
我的算法會等於75/216
但是答案為91/216 為何?
--------------------------------------------------------------
Q2: 題目如下
http://ppt.cc/vjZo
我試著用文氏圖去理解 但還是想不出B錯在哪
http://ppt.cc/OUwS
以上 謝謝
--
--
◢███◣ ▃▄▅▆ ◥◣ ▆▅▅▄▅ ◢ ▋ ◥◣
◢███◣◣◣◣ ▊ ▅▇█▅▄ █ █▅▋▊▂ █▇██▇
█▍███▄ ▄ ▃█▅▆ ▅ ▊ █ ▃▄ █▁ █
█▋ █◣ ︽◤ ▌ ▉ █ █ █ ▉ ▌ ▊▁▌▅▂ ▉
█ ██◣█◤ ▆▅███▅ █ ▋ ▊ ▋▁ ▍█▁ █▆▅▄
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