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

It is currently 25 Oct 2014, 13:23

Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

what is the probab of selecting a " clean" number from a set

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 25 Oct 2004
Posts: 250
Followers: 1

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

what is the probab of selecting a " clean" number from a set [#permalink] New post 18 Feb 2005, 08:00
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
what is the probab of selecting a " clean" number from a set of integers containing all multiples of 3 between 1 and 99, inclusive?

(1) A " clean" no is an integer divisible only by 2 factors, one of which is greater than 2

(2) A " clean" no must be odd
Senior Manager
Senior Manager
avatar
Joined: 15 Feb 2005
Posts: 254
Location: Rockville
Followers: 1

Kudos [?]: 6 [0], given: 0

 [#permalink] New post 18 Feb 2005, 08:05
I am gonna go off on a limb and chose A
because all multiples of 3 are not odd 3,6,9,12
and 3*1 works; 2*3 will also work....terefore negating statement two
(A)
Senior Manager
Senior Manager
avatar
Joined: 25 Oct 2004
Posts: 250
Followers: 1

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

 [#permalink] New post 18 Feb 2005, 08:14
Could you elaborate why stmt 2 is insuff.....I am lost.....
Senior Manager
Senior Manager
avatar
Joined: 15 Feb 2005
Posts: 254
Location: Rockville
Followers: 1

Kudos [?]: 6 [0], given: 0

 [#permalink] New post 18 Feb 2005, 08:46
Statement 2 is in sufficient cause it would mean that the clean numbers are 3, 5,7...
statement 1 shows that it is 3,5, 6,7..
does that show why there is at least 1 non odd number?
Senior Manager
Senior Manager
avatar
Joined: 30 Dec 2004
Posts: 296
Location: California
Followers: 1

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

 [#permalink] New post 18 Feb 2005, 18:48
My answer here is D.

The question is:
what is the probab of selecting a " clean" number from a set of integers containing all multiples of 3 between 1 and 99, inclusive?

So in my opinion all you need is a definition of what a clean number is. From both statements you can get a definite number of integers that fulfill the criterion mentioned...so therfore I think the answer is D.

And statement 2 should be sufficient because all you have to do is pick the odd number which are multiples of 3 and divide them by all the odd numbers between 1 and 99...don't see why that isn't sufficient
_________________

"No! Try not. Do. Or do not. There is no try.

Manager
Manager
avatar
Joined: 13 Feb 2005
Posts: 63
Location: Lahore, Pakistan
Followers: 1

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

 [#permalink] New post 18 Feb 2005, 19:20
greenandwise wrote:
My answer here is D.

The question is:
what is the probab of selecting a " clean" number from a set of integers containing all multiples of 3 between 1 and 99, inclusive?

So in my opinion all you need is a definition of what a clean number is. From both statements you can get a definite number of integers that fulfill the criterion mentioned...so therfore I think the answer is D.

And statement 2 should be sufficient because all you have to do is pick the odd number which are multiples of 3 and divide them by all the odd numbers between 1 and 99...don't see why that isn't sufficient



definitely, i agree with u my man...the basic object is to find 'probability' not 'validity'
Intern
Intern
avatar
Joined: 17 Feb 2005
Posts: 28
Location: SE Michigan
Followers: 0

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

 [#permalink] New post 19 Feb 2005, 09:20
This question is similar to another one posted here somewhere. Statement 1 gives a complete (in itself) definition of a clean number whereas Statement 2 only describes what could be one of many attributes of a clean no.

A it is!
Director
Director
avatar
Joined: 19 Nov 2004
Posts: 565
Location: SF Bay Area, USA
Followers: 3

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

 [#permalink] New post 19 Feb 2005, 11:24
The set is clearly defined. Whatever the restrictions the statements 1 and 2 impose, we can still find a single probability. So it is D

Note: If the set were infinite, we can't find a probability.

EDIT:
On rethink - A is probably it.
Statement 2 does not clearly define a Clean number.
A clean number must be odd does not imply all odd numbers are clean numbers.
VP
VP
User avatar
Joined: 25 Nov 2004
Posts: 1497
Followers: 6

Kudos [?]: 31 [0], given: 0

Re: DS-probab-multiples [#permalink] New post 19 Feb 2005, 21:52
swath20 wrote:
what is the probab of selecting a " clean" number from a set of integers containing all multiples of 3 between 1 and 99, inclusive?

(1) A " clean" no is an integer divisible only by 2 factors, one of which is greater than 2
(2) A " clean" no must be odd


using each statement seperately, both are suff to ans independently. but if you, take stat 1 into consideration 2 seems incomplete. we know that a clean number is only 3 and each st must give a specific answer. therefore, OA should be A. however, we cannot totaly disagree with the other part of the discussions.
Senior Manager
Senior Manager
avatar
Joined: 19 Feb 2005
Posts: 492
Location: Milan Italy
Followers: 1

Kudos [?]: 9 [0], given: 0

 [#permalink] New post 20 Feb 2005, 03:16
MA wrote:
thearch wrote:
IMO, That's right!


IMO=?


In my opinion :)
Senior Manager
Senior Manager
avatar
Joined: 02 Feb 2004
Posts: 345
Followers: 1

Kudos [?]: 11 [0], given: 0

Re: DS-probab-multiples [#permalink] New post 23 Feb 2005, 08:13
swath20 wrote:
what is the probab of selecting a " clean" number from a set of integers containing all multiples of 3 between 1 and 99, inclusive?

(1) A " clean" no is an integer divisible only by 2 factors, one of which is greater than 2

(2) A " clean" no must be odd


wait a second....
6 is divisible exactly by two factors ( I assume factors don't include 1 or the number itself) 2 and 3, but it's not odd.

So we need B.

answer should be C.
SVP
SVP
User avatar
Joined: 03 Jan 2005
Posts: 2251
Followers: 12

Kudos [?]: 204 [0], given: 0

Re: DS-probab-multiples [#permalink] New post 23 Feb 2005, 09:04
swath20 wrote:
what is the probab of selecting a " clean" number from a set of integers containing all multiples of 3 between 1 and 99, inclusive?

(1) A " clean" no is an integer divisible only by 2 factors, one of which is greater than 2

(2) A " clean" no must be odd


We are asked to find the probability. We are not asked to find one "clean" number. In other words, as some of the others already mentioned here, as long as the definition is clearly defined, then we will be able to identify all "clean" numbers and thus the probability of pick them from a clearly defined set.

On this note, (1) is clearly define, but (2) is not. (2) would be sufficient if it is formulated like this:
(2) A "clean" number means an odd number.

When it says a clean number must be odd, we do not know if there's other requirements for a clean number. Perhaps it must be odd and greater than 50? Or whatever. As long as we don't know the exact definition of a clean number, we cannot pin down the set of clean numbers, and thus cannot find the probability that we were asked to find.
Senior Manager
Senior Manager
avatar
Joined: 25 Oct 2004
Posts: 250
Followers: 1

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

 [#permalink] New post 25 Feb 2005, 10:56
Thanks Hong Hu for your detailed explanation
Manager
Manager
avatar
Joined: 24 Jan 2005
Posts: 217
Location: Boston
Followers: 1

Kudos [?]: 4 [0], given: 0

 [#permalink] New post 25 Feb 2005, 11:49
Should be D

As there are 33 possible outcomes or numbers.

(1) No of favorable outcomes: all Prime greater than 2 so Probab can be found

(2) favorable outcomes Only odd numbers again Probab can be found
  [#permalink] 25 Feb 2005, 11:49
    Similar topics Author Replies Last post
Similar
Topics:
2 Experts publish their posts in the topic What is the probability of selecting a clean number from a s voodoochild 5 26 Sep 2012, 10:35
Set S = If a number is selected from set S at random and bmwhype2 14 24 Oct 2007, 11:56
What is the probability of selecting a clean number from a GMATT73 9 26 Oct 2005, 06:52
A number is selected at random from the set of integers{ cloaked_vessel 4 25 Sep 2005, 08:20
If two different numbers are randomly selected from a set BG 9 02 Jun 2005, 08:08
Display posts from previous: Sort by

what is the probab of selecting a " clean" number from a set

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.