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# Gmatprep weird DS

Author Message
Intern
Joined: 19 Jan 2009
Posts: 18
Schools: Kellogg, Ross, Darden, Kelley, UNC

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18 May 2009, 11:56
00:00

Difficulty:

(N/A)

Question Stats:

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

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How to solve this one within 2 mins?

Hints are welcome

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Current Student
Joined: 13 May 2008
Posts: 141
Schools: LBS

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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!
Director
Joined: 23 May 2008
Posts: 757

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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
Senior Manager
Joined: 08 Jan 2009
Posts: 317

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18 May 2009, 20:05
Same explainaion as bigtreezl. Agree with C
Intern
Joined: 19 Jan 2009
Posts: 18
Schools: Kellogg, Ross, Darden, Kelley, UNC

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

--== Message from GMAT Club Team ==--

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If you would like to discuss this question please re-post it in the respective forum. Thank you!

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