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Prep Questions...please help me urgently

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by ankit1383 » Tue Sep 30, 2008 11:57 pm
If the drama club and music club are combined ,what percent of the combined membership will be male ?

1 Of the 16 members of the drama club ,15 are male

2 Of the 20 members of the music club,10 are male.

Ans E


Q 2

Circle C and line K in XY plane.If the circle is centered at the origin and has radius 1,does line K intersect circle C ?

1 The x- intercept of line K is greater than 1

2 the slope of line K is -1/10

Ans E


Please explain..........
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Source: — Data Sufficiency |
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by Saffa » Wed Oct 01, 2008 12:36 am
Are you sure the answer is E on the first Q.

1) Not suff - don't know anything about the other club
2) Not suff - ditto

But together we know the exact total of the males and the exact total of the two clubs combines, so TOGETHER they are SUFF

Disclaimer: Exept if there is crossover between the two clubs. Then E would be correct...so please comment on this

Second Q:

1) Not suff - we know nothing of the slope
2) Not suff - we know nothing of any of the intercepts, so cannot solve

Together - Not Suff as you are able to create a line that can go through the circle (y=-1/10x + 0.7) and create a line that does not (y=-1/10x + 1000).
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Answer

by ankit1383 » Wed Oct 01, 2008 2:25 am
Answer is E for the first question.
How can we be so sure about overlapping(students) in this case...
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Re: Answer

by Saffa » Wed Oct 01, 2008 2:49 am
ankit1383 wrote:Answer is E for the first question.
How can we be so sure about overlapping(students) in this case...
The answer would have been C otherwise. To be honest, I don't like that question, as they do not mention that the clubs are independent. Maybe if they stated that is WAS independent, the answer would have been C
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