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题库 / Prep2007E1-DS-20
A certain one-day seminar consisted of a morning session and an afternoon session. If each of the 128 people attending the seminar attended at least one of the two sessions, how many of the people attended the morning session only?
(1) ~$\frac{3}{4}$~ of the people attended both sessions.
(2) ~$\frac{7}{8}$~ of the people attended the afternoon session.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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答案没错，因为说了至少参加一场课程， 画出文氏图就发现，只要下午没上课的一定都是只去上午上课的人。
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