Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 06 Jul 2015, 23:07

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Is z an integer? (1) 2z is not an integer. (2) z/2 is not an

Author Message
TAGS:
Senior Manager
Affiliations: ACA, CPA
Joined: 26 Apr 2009
Posts: 445
Location: Vagabond
Schools: BC
WE 1: Big4, Audit
WE 2: Banking
Followers: 5

Kudos [?]: 50 [0], given: 41

Is z an integer? (1) 2z is not an integer. (2) z/2 is not an [#permalink]  15 Aug 2009, 02:18
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 100% (00:37) wrong based on 1 sessions
Is z an integer?

(1) 2z is not an integer.
(2) z/2 is not an integer.

_________________

If you have made mistakes, there is always another chance for you. You may have a fresh start any moment you choose, for this thing we call "failure" is not the falling down, but the staying down.

SVP
Joined: 05 Jul 2006
Posts: 1516
Followers: 5

Kudos [?]: 127 [0], given: 39

Re: integer [#permalink]  15 Aug 2009, 02:49
Is z an integer?

(1) 2z is not an integer.
(2) z/2 is not an integer.

from one

2 is even intiger , z is surely a fraction................suff

from 2

z could be intiger eg: 3 or it could be a fraction...insuff

A
Senior Manager
Affiliations: ACA, CPA
Joined: 26 Apr 2009
Posts: 445
Location: Vagabond
Schools: BC
WE 1: Big4, Audit
WE 2: Banking
Followers: 5

Kudos [?]: 50 [0], given: 41

Re: integer [#permalink]  15 Aug 2009, 03:14
thanks yezz.

OA is A

When the question stem says - 2z is not an integer
can we infer -- 2z is a fraction ?
_________________

If you have made mistakes, there is always another chance for you. You may have a fresh start any moment you choose, for this thing we call "failure" is not the falling down, but the staying down.

SVP
Joined: 05 Jul 2006
Posts: 1516
Followers: 5

Kudos [?]: 127 [0], given: 39

Re: integer [#permalink]  15 Aug 2009, 03:34
thanks yezz.

OA is A

When the question stem says - 2z is not an integer
can we infer -- 2z is a fraction ?

as far as GMAT is concerned i can say yes
Director
Joined: 01 Apr 2008
Posts: 904
Schools: IIM Lucknow (IPMX) - Class of 2014
Followers: 18

Kudos [?]: 333 [0], given: 18

Re: integer [#permalink]  15 Aug 2009, 12:28
Product of integer and integer is always an integer.
In 2z, 2 is already an integer, so if z is an integer then 2z will be an integer too, which is not allowed. So z should definitely be a fraction.
Now we can consider special fractions with denominator 2, so that 2z is reduced to z. But again, if 2z is not an integer, then z has to be some fraction.

Stmt 1 is sufficient.

For stmt 2, z can be 1/2 or 1 and so on. So insufficient.
Re: integer   [#permalink] 15 Aug 2009, 12:28
Similar topics Replies Last post
Similar
Topics:
4 For positive integer Z, is the expression (Z + 2)(Z^2 + 4Z + 5 10 Oct 2009, 21:25
7 If Z_1 , Z_2 , Z_3 , ..., Z_n is a sequence of consecutive 22 07 Jul 2009, 09:55
If z1 + z2 + z3 + .....+ zN is a series of consecutive 8 25 Nov 2007, 02:38
Is a nonzero integer Z prime? (1) |Z|^|Z|=4 (2) |Z^Z|=Z^2 3 11 Sep 2006, 09:10
z1,z2,z3....zn is a series of consecutive +ve integers; is 4 21 Oct 2005, 00:37
Display posts from previous: Sort by