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can not figure out this DS in Prep

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by yangliu0401 » Tue Mar 24, 2009 3:07 pm
A certain one-day seminar consisted of a morning session and an afternoon seesion. If each of 128 people attending at least one of the sesions, how many of the people attended the morning seesion ONLY?

1. 3/4 of the people attended both sessions
2. 7/8 of the people attended the afternoon session.

OA is B. Why not C? How can stem 2 alone be sufficient? :(
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Source: — Data Sufficiency |
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by bhavikrao » Tue Mar 24, 2009 6:18 pm
Yangliu,

The first choice says there 3/4 attended both the sessions, which means 96 attended both the sessions, 32 remains. This doesn't tell more info about those 32 folks

Second choice says 7/8th attended afternoon - that means 112 attended afternoon. So 128-112 attended Morning session

Hence B

thanks
Bhavik
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by yangliu0401 » Wed Mar 25, 2009 10:25 am
bhavikrao wrote:Yangliu,

The first choice says there 3/4 attended both the sessions, which means 96 attended both the sessions, 32 remains. This doesn't tell more info about those 32 folks

Second choice says 7/8th attended afternoon - that means 112 attended afternoon. So 128-112 attended Morning session

Hence B

thanks
Bhavik
Well, the Q asks the no. of people who attended the morning session ONLY. ,
From stem 2 we can just get there are 16 people who attended the morning session, but we can not get how many people attended both sessions. :(
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by eracnos » Wed Mar 25, 2009 3:13 pm
Definately those who did not come to the afternoon session are those who attend only morning ones since I they are suppose to be on @ least 1 of sessions.
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