In a group of 40 students, 30 of them are members of the mathematics club,18 of them are members of the english club,and all students must join at least one of the clubs as mentioned above
(a)how many students are members of both clubs?
(b)If a student is choosen at random,find the probability that the student is not a member of the mathematics club.
f3,probability--唔識
2007-12-30 7:34 am
回答 (2)
2007-12-30 7:58 am
✔ 最佳答案
樓上答錯左a) 30+18=48, therefore 8 student are members of both clubs
b) 1- 30/40 = 0.25
c) either one of the clubs 即係只係其中一個club 而唔可以係both
所以答案應該係
1 - 8/40 = 0.8, ( 8 student are members of both clubs )
希望幫到你
參考: 自己既計算
2007-12-30 7:43 am
a) 30+18=48, therefore 8 student are members of both clubs
b) 1- 30/40 = 0.25
c) 1. As question said ' all students must join as least one of the clubs'
b) 1- 30/40 = 0.25
c) 1. As question said ' all students must join as least one of the clubs'
收錄日期: 2021-04-13 14:49:49
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