If z is a positive integer, does z have more than 2 positive : GMAT Data Sufficiency (DS)
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 21 Jan 2017, 09:11

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

If z is a positive integer, does z have more than 2 positive

Author Message
TAGS:

Hide Tags

Manager
Joined: 18 Jun 2011
Posts: 58
Followers: 1

Kudos [?]: 121 [0], given: 0

If z is a positive integer, does z have more than 2 positive [#permalink]

Show Tags

20 Jun 2011, 19:46
00:00

Difficulty:

45% (medium)

Question Stats:

71% (01:34) correct 29% (00:51) wrong based on 14 sessions

HideShow timer Statistics

If z is a positive integer, does z have more than 2 positive integer factors?

(1) 23 < z < 29

(2) z is odd.
[Reveal] Spoiler: OA
SVP
Joined: 16 Nov 2010
Posts: 1672
Location: United States (IN)
Concentration: Strategy, Technology
Followers: 33

Kudos [?]: 514 [0], given: 36

Re: Tricky DS - Factors based problem [#permalink]

Show Tags

20 Jun 2011, 21:26
The question is asking whether z is a prime

(1) 23 < z < 29

z can be 25,26,27,28, all of which are composite numbers so Sufficient

(2) z is odd.

Not Sufficient as z can be 3 (Prime) or 9 (Composite)

_________________

Formula of Life -> Achievement/Potential = k * Happiness (where k is a constant)

GMAT Club Premium Membership - big benefits and savings

Manager
Joined: 16 Mar 2011
Posts: 177
Followers: 1

Kudos [?]: 37 [0], given: 13

Re: Tricky DS - Factors based problem [#permalink]

Show Tags

21 Jun 2011, 00:01
A indeed.

Statement 1: Z can be 24,25,26,27,28, having factors of respectively: 2^3(3), 5^2, 2(13), 3^3, 7(2^2),

as you can see no value for Z has more than 2 different integer factors.

Statement 2: insufficient. Z could be anything. Z could be 15, having 2 different factors. But it could alsof be 105 having 3 different factors (3,5,7).
VP
Status: There is always something new !!
Affiliations: PMI,QAI Global,eXampleCG
Joined: 08 May 2009
Posts: 1353
Followers: 17

Kudos [?]: 240 [0], given: 10

Re: Tricky DS - Factors based problem [#permalink]

Show Tags

23 Jun 2011, 02:34
a all integers between 23 and 29 have more than 2 factors. Sufficient.

b 1,3,9 give different values. Not sufficient.

A it is.
_________________

Visit -- http://www.sustainable-sphere.com/
Promote Green Business,Sustainable Living and Green Earth !!

Manager
Joined: 19 Apr 2011
Posts: 111
Followers: 2

Kudos [?]: 3 [0], given: 2

Re: Tricky DS - Factors based problem [#permalink]

Show Tags

24 Jun 2011, 02:20
23 < z < 29
No prime numbers in the range above So all have more than 2 factors Sufficient
Some odd numbers are prime some are non prime
Re: Tricky DS - Factors based problem   [#permalink] 24 Jun 2011, 02:20
Similar topics Replies Last post
Similar
Topics:
Does positive integer z equal 7? 4 14 Sep 2016, 05:22
1 Does positive integer z equal 5? 1 05 Sep 2016, 07:54
3 Is positive integer z greater than 275? 2 12 Sep 2015, 22:23
4 If k is a positive integer, does k have more than 3 differen 5 30 Jun 2012, 07:22
4 For positive integer Z, is the expression (Z + 2)(Z^2 + 4Z + 5 10 Oct 2009, 21:25
Display posts from previous: Sort by