2. 外语
  3. In a nationwide poll, P people were asked 2 questions. If 2/5 answered "yes" to question 1, and of those 1/3 also answered "yes"

In a nationwide poll, P people were asked 2 questions. If 2/5 answered "yes" to question 1, and of those 1/3 also answered "yes"

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问题 In a nationwide poll, P people were asked 2 questions. If 2/5 answered "yes" to question 1, and of those 1/3 also answered "yes" to question 2, which of the following represents the number of people polled who did not answer "yes" to both questions?
选项 A、2/15 P
B、3/5 P
C、3/4 P
D、5/6 P
E、13/15 P
答案E
解析 The people who answered "yes" to both questions are 1/3 of 2/5 P, so 2/15 P. Therefore, the people who did not answer "yes" to both questions are P-2/15 P=13/15 P.
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