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HARD DS Number Properties:(

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Manager
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HARD DS Number Properties:( [#permalink] New post 06 Aug 2006, 14:37
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions
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Director
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 [#permalink] New post 06 Aug 2006, 15:47
I would go with A

if we solve it we get

x = z - y

or

- x = y - z

that means y - x = - x NOT | X | so A is good

whats the OA
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 [#permalink] New post 06 Aug 2006, 16:20
It should be (C)

If x<0, the main expression becomes -x=y-z, or x+y=z (which copies ST1)
However, if x>=0, we open it up as x=y-z, or z=y-x.

So, ST1 is not suff

ST2 does not give us much, only that x<0. So, not suff.

But after we combine ST1 and ST2, we know that if x<0 and x+y=z is true, the main expression must also be true.

So, (C)
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 [#permalink] New post 06 Aug 2006, 16:57
RX,

See that is what I did, I solved and got A
That was my mistake too
  [#permalink] 06 Aug 2006, 16:57
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HARD DS Number Properties:(

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