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Gmatprep weird DS

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Intern
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Joined: 19 Jan 2009
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Schools: Kellogg, Ross, Darden, Kelley, UNC
Gmatprep weird DS [#permalink]

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New post 18 May 2009, 11:56
00:00
A
B
C
D
E

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0% (00:00) correct 0% (00:00) wrong based on 0 sessions

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How to solve this one within 2 mins?

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Current Student
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Joined: 13 May 2008
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Schools: LBS
Re: Gmatprep weird DS [#permalink]

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New post 18 May 2009, 12:41
no solving just thinking... (in my opinion!) ST1 is not sufficient b/c we know that if anyone of the a,b or c is 7 the other two can take any value.. so you need to suffice the condition for two variables to say that the third one is 7. ST2 does exactly that bc=18 means 'bc' is some combination of 2x9 or 3x6 or 18x1 since they all are integers... none of them are 7 so 'a' has to be 7 to suffice ST1... which will give you the value for a!

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Director
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Re: Gmatprep weird DS [#permalink]

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New post 18 May 2009, 15:14
1. either a,b or c=7 a=? insuff

2. bc=18, no factors of 7, neither b or c=7

together

a must =7

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Senior Manager
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Re: Gmatprep weird DS [#permalink]

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New post 18 May 2009, 20:05
Same explainaion as bigtreezl. Agree with C

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Intern
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Re: Gmatprep weird DS [#permalink]

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New post 18 May 2009, 23:41
Great explanations guys, thank you!!

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Re: Gmatprep weird DS   [#permalink] 18 May 2009, 23:41
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