GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 13 Aug 2018, 23:42

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.

Close

Request Expert Reply

Confirm Cancel

A gardener is going to plant 2 red rosebushes and 2 white

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Intern
Intern
avatar
Joined: 08 Nov 2008
Posts: 38
A gardener is going to plant 2 red rosebushes and 2 white  [#permalink]

Show Tags

New post 11 Dec 2008, 14:38
A gardener is going to plant 2 red rosebushes and 2 white rosebushes. If the gardener is to select each of the bushes at random, one at a time, and plant them in a row, what is the probability that the 2 rosebushes in the middle of the row will be the red rosebushes?

A. 1/12
B. 1/6
C. 1/5
D. 1/3
E. 1/2

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
SVP
SVP
User avatar
Joined: 30 Apr 2008
Posts: 1841
Location: Oklahoma City
Schools: Hard Knocks
Re: rose  [#permalink]

Show Tags

New post 11 Dec 2008, 14:51
B. 1/6

We're not treating this as 4 separate rose bushes, but 1 group of white (made up of 2 bushes) and 1 group of red (made up of 2 bushes).

If we had 4 separate rose bushes, that'd be 4! combinations, but we must divide out 2 because of the 2 red bushes (if you kept the white in place and swapped out the red, you'd still have the same color arrangement) and then divide again by 2 for the same situation with keeping the red in place and swapping the white.

so 24 / 2 = 12...12/2 = 6. Now, only 1 of these color combinations has W R R W, for 1/6.
_________________

------------------------------------
J Allen Morris
**I'm pretty sure I'm right, but then again, I'm just a guy with his head up his a$$.

GMAT Club Premium Membership - big benefits and savings

SVP
SVP
User avatar
Joined: 29 Aug 2007
Posts: 2420
Re: rose  [#permalink]

Show Tags

New post 11 Dec 2008, 15:02
gorden wrote:
A gardener is going to plant 2 red rosebushes and 2 white rosebushes. If the gardener is to select each of the bushes at random, one at a time, and plant them in a row, what is the probability that the 2 rosebushes in the middle of the row will be the red rosebushes?

A. 1/12
B. 1/6
C. 1/5
D. 1/3
E. 1/2


TOTAL = 4!
2R IN THE MIDDLE = 2X2 = 4 AS UNDER

W1 R1 R2 W2
W1 R2 R1 W2
W2 R1 R2 W1
W2 R2 R1 W1


= 4/4!
= 1/6

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________

Verbal: http://gmatclub.com/forum/new-to-the-verbal-forum-please-read-this-first-77546.html
Math: http://gmatclub.com/forum/new-to-the-math-forum-please-read-this-first-77764.html
Gmat: http://gmatclub.com/forum/everything-you-need-to-prepare-for-the-gmat-revised-77983.html


GT

Re: rose &nbs [#permalink] 11 Dec 2008, 15:02
Display posts from previous: Sort by

A gardener is going to plant 2 red rosebushes and 2 white

  post reply Question banks Downloads My Bookmarks Reviews Important topics  

Moderator: chetan2u

Events & Promotions

PREV
NEXT


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

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

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®.