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If x y = 8, which of the following must be true? I. Both

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Intern
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Joined: 19 Nov 2004
Posts: 45
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Kudos [?]: 3 [0], given: 0

If x y = 8, which of the following must be true? I. Both [#permalink] New post 19 Dec 2004, 17:43
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B
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D
E

Difficulty:

  5% (low)

Question Stats:

100% (01:51) correct 0% (00:00) wrong based on 1 sessions
10. If x – y = 8, which of the following must be true?

I. Both x and y are positive
II. If x is positive, y must be positive
III. If x is negative, y must be negative


0 I only
0 II only
0 III only
0 I and II
0 II and III

Unfortunately, I have no clue on how to solve this question.
Manager
Manager
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Joined: 26 Dec 2003
Posts: 227
Location: India
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GMAT Tests User
 [#permalink] New post 19 Dec 2004, 21:45
To solve this kind of problems. Take some numbers and play with answer choices. In this case 3 only as addition of negative and negative cant be positive
  [#permalink] 19 Dec 2004, 21:45
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If x y = 8, which of the following must be true? I. Both

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