I only 15
II only 10
III only 13
I and II only 31
I and III only 20
II and III only 25
I,II,and III 48
The table aboveshows the results of a survey of 200 people who were asked if they were memebers of any of the following groups:(I)regular churchgoers(II)registered voters and(III) high school graduates.How many of those responding to the survey were high school graduates?
(A)18
(B)33
(C)48
(D)81
(E)106
Ans:(E)
我知道這題是考A U B U C的概念~但是不會解...
請大大幫忙
