If a,b, and c are integers, what is the value of a?

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gmattesttaker2: Legendary Member; Posts: 641; Joined: Tue Feb 14, 2012 3:52 pmFollowed by: 8 members; Thanked: 11 times

by gmattesttaker2 » Sat Oct 06, 2012 10:00 am

Hello,

This is from GMATPrep s/w:

If a, b, and c are integers, what is the value of ?

1) (a-7)(b-7)(c-7) = 0
2) bc = 18

OA: C

Thanks for your help.

Best Regards,
Sri

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Source: Beat The GMAT — Data Sufficiency | Sat Oct 06, 2012 10:00 am

anuprajan5: Master | Next Rank: 500 Posts; Posts: 279; Joined: Mon Jun 25, 2012 10:56 pmFollowed by: 10 members; Thanked: 60 times

by anuprajan5 » Sat Oct 06, 2012 10:48 am

The question is incomplete. WHat is the value of ?

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das.ashmita: Master | Next Rank: 500 Posts; Posts: 118; Joined: Mon May 21, 2012 10:07 pmFollowed by: 4 members; Thanked: 23 times

by das.ashmita » Sat Oct 06, 2012 1:31 pm

Hi
I have come across this question, Its asking for the value of a

Here is my approach:

From statement 1 : (a-7)(b-7)(c-7) = 0
(a-7)=0 or (b-7)=0 or (c-7)=0
In other words, either a=7 or b=7 or c=7
Therefore, Not suff

From statement 2: bc = 18
value of a is not given.
Therefore, Not suff

Combining the 2 statements

Since its given that a,b,c are integers, b & c are certainly not equal to 7 (as bc=18=2*3*3).
Therefore a=7

ANS C

Hope it helps

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gmattesttaker2: Legendary Member; Posts: 641; Joined: Tue Feb 14, 2012 3:52 pmFollowed by: 8 members; Thanked: 11 times

by gmattesttaker2 » Sat Oct 06, 2012 9:43 pm

anuprajan5 wrote:The question is incomplete. WHat is the value of ?

Hello Anup,

It should be 'a' as Ashmita rightly pointed out. Sorry for my oversight. @Ashmita, thanks for your help.

Best Regards,
Sri

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