GWD 兩題數學題問題

[morgan.tung]

1) A shipment of 8 television sets contains 2 black-and-white sets and 6 color sets. If 2 television sets are to be chosen at random from this shipment, what is the probability that at least 1 of the 2 sets chosen will be a black-and-white set ?


另ㄧ個類似題目, 但問的是" 幾種選取可能 "

2) There are 8 books on a shelf, of which 2 are paperbacks and 6 are hardbacks. How many possible selections of 4 books from this self include at least one paperback?


感謝嚕~~

[abc123[origen]]

不知道對不對，要公佈答案哦。
1)
1+2*(6!/5!)+(6!/4!2!) = 28 (全部的可能）
1+2*(6!/5!) = 13 （至少一台黑白的可能）
ans: 13/28
2)
(2*(6!/3!3!)) + (1*(6!/2!4!)) = 40+15 = 55

[morgan.tung]

謝謝你嚕~~

我手邊的解答第一題是 13/26 ; 第二題是 50 種 ; 不過我覺得解答是錯的~~

你的解說非常詳細明瞭, 感謝喔!!!!