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a, b and are consecutive integers where a<b<c. which

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Joined: 22 Nov 2007
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a, b and are consecutive integers where a<b<c. which [#permalink]

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New post 25 Jan 2008, 00:46
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a, b and are consecutive integers where a<b<c. which of the following could not be the valeu of c^2-b^2-a^2?

-21
-12
-6
0
3

Kudos [?]: 688 [0], given: 0

SVP
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Joined: 04 May 2006
Posts: 1878

Kudos [?]: 1443 [0], given: 1

Schools: CBS, Kellogg
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Re: % [#permalink]

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New post 25 Jan 2008, 01:13
marcodonzelli wrote:
a, b and are consecutive integers where a<b<c. which of the following could not be the valeu of c^2-b^2-a^2?

-21
-12
-6
0
3


abc =-4-3-2, 4-9-16=-21, A out
abc = -3-2-1, 1-4-9=-12 , B out
abc = -2-1, 0, 0 -1-4 = -5, C in
abc = -1, 0, 1, 1-0-1 = 0, D out
abc = 0 1 2, 4-1-0=3, E out

C

Anyway, where is Walker?
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Kudos [?]: 1443 [0], given: 1

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CEO
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Kudos [?]: 4670 [0], given: 360

Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
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Re: % [#permalink]

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New post 25 Jan 2008, 01:36
i think you have right answer :)
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Kudos [?]: 4670 [0], given: 360

Re: %   [#permalink] 25 Jan 2008, 01:36
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a, b and are consecutive integers where a<b<c. which

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