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If XY=1, what is the value of / ? A. 2 B. 4 C. 8 D.

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Manager
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If XY=1, what is the value of / ? A. 2 B. 4 C. 8 D. [#permalink] New post 01 Feb 2006, 19:53
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If XY=1, what is the value of [2(X+Y)^2] / [2(X-Y)^2]?

A. 2
B. 4
C. 8
D. 16
E. 32
Intern
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 [#permalink] New post 01 Feb 2006, 20:58
Sorry, shouldve put my explanation...not so sure it's right so i didn't

2x^2+2y^2/2x^2-2y^2 =

where xy = 1 (1x1 or -1x-1)

2(1)^2/-2(1)^2 =

2+2/2-2 = 4

works for -1 as well
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 [#permalink] New post 02 Feb 2006, 10:13
The answer in GMAtprep is 16. I don't know how to come up with that answer !!!
Manager
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 [#permalink] New post 02 Feb 2006, 12:30
It has been discussed many times. There is something wrong with the question.
  [#permalink] 02 Feb 2006, 12:30
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If XY=1, what is the value of / ? A. 2 B. 4 C. 8 D.

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