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# HARD DS Number Properties:(

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Manager
Joined: 08 May 2004
Posts: 158
Location: Pittsburgh
Followers: 1

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

HARD DS Number Properties:( [#permalink]  06 Aug 2006, 14:37
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions
Help....
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Director
Joined: 07 Jun 2004
Posts: 614
Location: PA
Followers: 3

Kudos [?]: 318 [0], given: 22

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
Manager
Joined: 26 Jun 2006
Posts: 152
Followers: 1

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

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)
Manager
Joined: 08 May 2004
Posts: 158
Location: Pittsburgh
Followers: 1

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

RX,

See that is what I did, I solved and got A
That was my mistake too
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