A certain one-day seminar consisted of a morning session and an afternoon session. If each of the 128 people attending

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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) 3/4 of the people attended both sessions.
(2) 7/8 of the people attended the afternoon session.

Answer: B

Source: GMAT Prep