題目來自朋友給的老方模考題
覺得這兩題缺乏部分關鍵字 所以自己在練習的時候覺得很怪....
因為記得在寫其他來源的類似題目時 都不會有這種情形
第一題
In a class of 20 students, half of them are boys. A student
commitee consists of 7 students who are selected from the class
and the first 6 students are girls
Quantity A Quatity B
The probability that the seventh
2/7
selected student is girl
這題下意識就想是 (10 - 6) / (20 - 6) = 2/7
但後來發現題目裡沒有 "Randomly selected" 這個我在其他機率題目中
會發現的關鍵字...