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# DS: Z

Author Message
Senior Manager
Joined: 19 Mar 2008
Posts: 351

Kudos [?]: 68 [0], given: 0

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30 Aug 2008, 01:36
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

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Kudos [?]: 68 [0], given: 0

Intern
Joined: 15 Aug 2008
Posts: 19

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

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30 Aug 2008, 02:21
say n=2, then Z could be either 1 or -1. therefore z>0 is required to.

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SVP
Joined: 07 Nov 2007
Posts: 1792

Kudos [?]: 1065 [0], given: 5

Location: New York

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30 Aug 2008, 13:52
judokan wrote:

Agree with C.

1) When is any postive even integer..then z = -1 or 1 --> not suffcient
2)when z>0 z=100 n=0 or z =1 n=1
not suffcient

combine..
z=1 suffcient
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Kudos [?]: 1065 [0], given: 5

Re: DS: Z   [#permalink] 30 Aug 2008, 13:52
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