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# If a,b,c are inetegers .What would be the value of a ?

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Manager
Joined: 23 May 2007
Posts: 108

Kudos [?]: 25 [0], given: 0

If a,b,c are inetegers .What would be the value of a ? [#permalink]

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09 Jun 2007, 20:16
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DS Question

If a,b,c are inetegers .What would be the value of a ?
1.(a-7)*(b-7)*(c-7) = 0
2. bc = 18

Kudos [?]: 25 [0], given: 0

CEO
Joined: 17 May 2007
Posts: 2950

Kudos [?]: 654 [0], given: 210

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09 Jun 2007, 20:27
if bc = 18 then neither b nor c can be 7 therefore to satisfy
1.(a-7)*(b-7)*(c-7) = 0

a = 7

Thus the answer is C.

Kudos [?]: 654 [0], given: 210

Manager
Joined: 23 May 2007
Posts: 108

Kudos [?]: 25 [0], given: 0

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09 Jun 2007, 21:14
The answer is C .But we can get that answer straighaway from 1 .Why do we need 2 ie bc =18??

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CEO
Joined: 17 May 2007
Posts: 2950

Kudos [?]: 654 [0], given: 210

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09 Jun 2007, 23:04
could you explain how to get it straight from 1 ?

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Intern
Joined: 02 Jun 2007
Posts: 27

Kudos [?]: [0], given: 0

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15 Jun 2007, 14:17
I get C.

i) a can be any integer, as long as b=7 or c=7. since we dont know what b or c are, we can't say what a is. INSUFF

ii) if bc=18, then their only possible values are 6,3,18,1,2,9 (+/-). but we have no idea what a is.

i & ii) since neither b or c equal 7, which is needed to make one of the terms (b-7) or (c-7) = 0, then it must be a. so a=7.

C

Kudos [?]: [0], given: 0

15 Jun 2007, 14:17
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# If a,b,c are inetegers .What would be the value of a ?

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