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If a,b and c are integers, what is the value of a? 1)

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Senior Manager
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If a,b and c are integers, what is the value of a? 1) [#permalink] New post 15 Jun 2008, 11:27
If a,b and c are integers, what is the value of a?
1) (a-7)(b-7)(c-7) = 0
2) bc = 18
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Re: Know your alphabets [#permalink] New post 15 Jun 2008, 13:05
E

3 unknowns but only 2 equations.
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Re: Know your alphabets [#permalink] New post 15 Jun 2008, 13:11
I'll have to go with C here.

A tells us either a = 7 or b = 7 or c =7 ... so not sufficient.

B tells us nothing about A.

but together, since 18 is not divisible by 7, it tells us b not equal 7 and c not equal 7 , hence a MUST be 7

so C.

Vavali wrote:
If a,b and c are integers, what is the value of a?
1) (a-7)(b-7)(c-7) = 0
2) bc = 18
Senior Manager
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Re: Know your alphabets [#permalink] New post 15 Jun 2008, 13:13
bsd_lover wrote:
I'll have to go with C here.

A tells us either a = 7 or b = 7 or c =7 ... so not sufficient.

B tells us nothing about A.

but together, since 18 is not divisible by 7, it tells us b not equal 7 and c not equal 7 , hence a MUST be 7

so C.

Vavali wrote:
If a,b and c are integers, what is the value of a?
1) (a-7)(b-7)(c-7) = 0
2) bc = 18



Spot on bsd_lover lover The OA is C. Thanks
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Re: Know your alphabets [#permalink] New post 16 Jun 2008, 06:37
C for me as well.

I started with stat 2, with tells me nothing about a, so B and D are out.

From stat 1, all we know is that one of the terms in brackets works out to 0, so either a=7, b=7 , c=7. insuff.

Together, we know that neither b nor c are 0, so the only option left to make the eqn in stat 1 equal to 0 is that a=7.
Re: Know your alphabets   [#permalink] 16 Jun 2008, 06:37
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If a,b and c are integers, what is the value of a? 1)

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