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HARD DS Number Properties:(

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HARD DS Number Properties:( [#permalink] New post 06 Aug 2006, 15:37
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 [#permalink] New post 06 Aug 2006, 16:47
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, 17:20
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, 17:57
RX,

See that is what I did, I solved and got A
That was my mistake too
  [#permalink] 06 Aug 2006, 17:57
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HARD DS Number Properties:(

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