SAT数学-集合 Example 03

发布于 2015-08-30  98 次阅读

Question 1
In a survey, 78 people were asked about two television programs, X and Y. Of the people surveyed, 56 watch program X, 42 watch program Y, and 7 watch neither program. How many of the people surveyed watch both programs?
A
15
B
20
C
27
D
29
E
36
Question 1 Explanation: 
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