Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 29 May 2017, 00:17

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

GMatPrep-DS-Divisability

Author Message
Intern
Joined: 05 Mar 2007
Posts: 24
Followers: 0

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

Show Tags

08 Sep 2007, 13:47
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions

HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Can some explain why the OE is not C for this.

From 1) m={5,7,11,13,17,19,23,25,29} - m is divisible by itself ,or itself and 5(Prime), So 1 Should not be sufficient

From 2) m = {3,7,9,11,13,17,19,21,23,27,29} - m is divisible by itsefl ,or itself and 3(Prime), so 2 is not sufficient.

from 1& 2 m= {5,7,11,13,17,19,23,29} - So only m is divisible by itself.

Astonishingly, the OE is not C.
Attachments

DS2.JPG [ 86.24 KiB | Viewed 691 times ]

Manager
Joined: 09 Dec 2006
Posts: 96
Followers: 1

Kudos [?]: 34 [0], given: 0

Show Tags

08 Sep 2007, 14:33
zion wrote:
Can some explain why the OE is not C for this.

From 1) m={5,7,11,13,17,19,23,25,29} - m is divisible by itself ,or itself and 5(Prime), So 1 Should not be sufficient

From 2) m = {3,7,9,11,13,17,19,21,23,27,29} - m is divisible by itsefl ,or itself and 3(Prime), so 2 is not sufficient.

from 1& 2 m= {5,7,11,13,17,19,23,29} - So only m is divisible by itself.

Astonishingly, the OE is not C.

{5,7,11,13,17,19,23,25,29} all numbers divisible only by 1 prime
Check it: all primes divisible only by itself, and 5 and 25 divisible only by one prime - 5
A it is.
Director
Joined: 03 May 2007
Posts: 875
Schools: University of Chicago, Wharton School
Followers: 6

Kudos [?]: 209 [0], given: 7

Show Tags

09 Sep 2007, 14:28
zion wrote:
Can some explain why the OE is not C for this.

From 1) m={5,7,11,13,17,19,23,25,29} - m is divisible by itself ,or itself and 5(Prime), So 1 Should not be sufficient

From 2) m = {3,7,9,11,13,17,19,21,23,27,29} - m is divisible by itsefl ,or itself and 3(Prime), so 2 is not sufficient.

from 1& 2 m= {5,7,11,13,17,19,23,29} - So only m is divisible by itself.

Astonishingly, the OE is not C.

Though the answer is uniform value, m is different. i am not how properly designed the question.
Manager
Joined: 16 Feb 2007
Posts: 71
Followers: 1

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

Show Tags

09 Sep 2007, 14:45
Piter wrote:
zion wrote:
Can some explain why the OE is not C for this.

From 1) m={5,7,11,13,17,19,23,25,29} - m is divisible by itself ,or itself and 5(Prime), So 1 Should not be sufficient

From 2) m = {3,7,9,11,13,17,19,21,23,27,29} - m is divisible by itsefl ,or itself and 3(Prime), so 2 is not sufficient.

from 1& 2 m= {5,7,11,13,17,19,23,29} - So only m is divisible by itself.

Astonishingly, the OE is not C.

{5,7,11,13,17,19,23,25,29} all numbers divisible only by 1 prime
Check it: all primes divisible only by itself, and 5 and 25 divisible only by one prime - 5
A it is.

another explanation is that when the number is odd and not divisible by 3, the next prime numbers are 5 and 7; the first number divisible by both 7 and 5 is 35, but 35 is out of definition, so it has to be only one distinct prime factor, thats why A is correct

if it is not divisible by 5, then 3 and 7 are possible and it could be for example 21 with two distinct primes
Re: GMatPrep-DS-Divisability   [#permalink] 09 Sep 2007, 14:45
Display posts from previous: Sort by