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) 3/4of the people attended both sessions.
(2) 7/8of the people attended the afternoon session.
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发表于 2009-1-19 16:32:00
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