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# Gmat prep DS

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Manager
Joined: 20 Mar 2005
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07 Nov 2007, 05:51
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please explain this ..i dont have the OA.
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SVP
Joined: 05 Jul 2006
Posts: 1515
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Kudos [?]: 256 [0], given: 39

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07 Nov 2007, 12:22
if m is prime

then highet divisor might be either m or 1 given that n is not prime and n is a multiple of m...............insuff

from 2

m = 2/7n,,,,,,,,,n is a mutliple of 7 and m is even........insuff

both

m = 2 and n = 7x.........insuff, devisor could be 1 or 2.

I say E
Manager
Joined: 20 Mar 2005
Posts: 170
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Kudos [?]: 67 [0], given: 0

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07 Nov 2007, 16:11
From A and B together

A says m is prime....2, 3, 5, 7

from B m = 2n/7

B says m Even so only number for m can be 2
and n =7

so GCD can be 1

Is it Ok or am i missing something?
VP
Joined: 28 Mar 2006
Posts: 1381
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Kudos [?]: 30 [0], given: 0

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07 Nov 2007, 19:10
yezz wrote:
if m is prime

then highet divisor might be either m or 1 given that n is not prime and n is a multiple of m...............insuff

from 2

m = 2/7n,,,,,,,,,n is a mutliple of 7 and m is even........insuff

both

m = 2 and n = 7x.........insuff, devisor could be 1 or 2.

I say E

Longtime welcome back
SVP
Joined: 29 Aug 2007
Posts: 2492
Followers: 67

Kudos [?]: 707 [0], given: 19

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07 Nov 2007, 20:29
Balvinder wrote:
From A and B together

A says m is prime....2, 3, 5, 7

from B m = 2n/7

B says m Even so only number for m can be 2
and n =7

so GCD can be 1

Is it Ok or am i missing something?

You are ok. it should be C since m is a prime and 2n = 7m, the common divisor is 1.
CEO
Joined: 29 Mar 2007
Posts: 2583
Followers: 19

Kudos [?]: 386 [0], given: 0

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07 Nov 2007, 23:28
Balvinder wrote:
please explain this ..i dont have the OA.

Stem is asking for GCF of N and M. Also important to note that N and M are integers.

S1: M= prime #, no help.

S2: 2N=7M --> N=7/2M Since N is an integer M MUST be divisible by 2. The opposite is true for N, b/c M=2N/7 N must be divisble by 7.

However, as u can see N and M can be anything so long as they fit this criteria. Insuff.

B/c M is prime and must be divisible by 2, then M must be 2.

So N=7. GCF is 1.

C
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07 Nov 2007, 23:54
Hi Trivi been a long time , i was reallocated to another country and i had to put my MBA plans on hold for a while.

Guys You are right n = 7 , the moral is ..........never try to solve tricky GMAT late at night after working for 14 hours.
Display posts from previous: Sort by
The content of the passage includes a mathematical question and an attempt to solve it, but the solution is not fully confirmed. The structure is a mix of a question and partial reasoning.
single_question_with_answer
Given a text passage, determine:
    1. If it contains a mathematical question (including word problems or calculations)
    2. If an answer to that mathematical question is provided in the text

First, describe the content structure you found in 1-2 sentences.

Then provide your analysis in the following format:
TYPE: <one of the following values>
- NO_QUESTION
- SINGLE_QUESTION
- SINGLE_QUESTION_WITH_ANSWER
- MULTIPLE_QUESTIONS
- MULTIPLE_QUESTIONS_WITH_ANSWERS
system
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 It is currently 25 Sep 2016, 00:14

### GMAT Club Daily Prep

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# Gmat prep DS

Author Message
Manager
Joined: 20 Mar 2005
Posts: 170
Followers: 2

Kudos [?]: 67 [0], given: 0

### Show Tags

07 Nov 2007, 05:51
00:00

Difficulty:

(N/A)

Question Stats:

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

### HideShow timer Statistics

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

please explain this ..i dont have the OA.
Attachments

Ppt0000000.jpg [ 24.96 KiB | Viewed 663 times ]

SVP
Joined: 05 Jul 2006
Posts: 1515
Followers: 5

Kudos [?]: 256 [0], given: 39

### Show Tags

07 Nov 2007, 12:22
if m is prime

then highet divisor might be either m or 1 given that n is not prime and n is a multiple of m...............insuff

from 2

m = 2/7n,,,,,,,,,n is a mutliple of 7 and m is even........insuff

both

m = 2 and n = 7x.........insuff, devisor could be 1 or 2.

I say E
Manager
Joined: 20 Mar 2005
Posts: 170
Followers: 2

Kudos [?]: 67 [0], given: 0

### Show Tags

07 Nov 2007, 16:11
From A and B together

A says m is prime....2, 3, 5, 7

from B m = 2n/7

B says m Even so only number for m can be 2
and n =7

so GCD can be 1

Is it Ok or am i missing something?
VP
Joined: 28 Mar 2006
Posts: 1381
Followers: 2

Kudos [?]: 30 [0], given: 0

### Show Tags

07 Nov 2007, 19:10
yezz wrote:
if m is prime

then highet divisor might be either m or 1 given that n is not prime and n is a multiple of m...............insuff

from 2

m = 2/7n,,,,,,,,,n is a mutliple of 7 and m is even........insuff

both

m = 2 and n = 7x.........insuff, devisor could be 1 or 2.

I say E

Longtime welcome back
SVP
Joined: 29 Aug 2007
Posts: 2492
Followers: 67

Kudos [?]: 707 [0], given: 19

### Show Tags

07 Nov 2007, 20:29
Balvinder wrote:
From A and B together

A says m is prime....2, 3, 5, 7

from B m = 2n/7

B says m Even so only number for m can be 2
and n =7

so GCD can be 1

Is it Ok or am i missing something?

You are ok. it should be C since m is a prime and 2n = 7m, the common divisor is 1.
CEO
Joined: 29 Mar 2007
Posts: 2583
Followers: 19

Kudos [?]: 386 [0], given: 0

### Show Tags

07 Nov 2007, 23:28
Balvinder wrote:
please explain this ..i dont have the OA.

Stem is asking for GCF of N and M. Also important to note that N and M are integers.

S1: M= prime #, no help.

S2: 2N=7M --> N=7/2M Since N is an integer M MUST be divisible by 2. The opposite is true for N, b/c M=2N/7 N must be divisble by 7.

However, as u can see N and M can be anything so long as they fit this criteria. Insuff.

B/c M is prime and must be divisible by 2, then M must be 2.

So N=7. GCF is 1.

C
SVP
Joined: 05 Jul 2006
Posts: 1515
Followers: 5

Kudos [?]: 256 [0], given: 39

### Show Tags

07 Nov 2007, 23:54
Hi Trivi been a long time , i was reallocated to another country and i had to put my MBA plans on hold for a while.

Guys You are right n = 7 , the moral is ..........never try to solve tricky GMAT late at night after working for 14 hours.
Display posts from previous: Sort by
user
The content of the passage includes a mathematical question and an attempt to solve it, but the solution is not fully confirmed. The structure is a mix of a question and partial reasoning.

TYPE: SINGLE_QUESTION_WITH_ANSWER