It is currently 23 Oct 2017, 08:41

### 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

# There are 7 keys in a key ring. If two more keys are to be

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
Current Student
Joined: 11 May 2008
Posts: 555

Kudos [?]: 222 [0], given: 0

### Show Tags

01 Aug 2008, 09:31
WELL, to tell u frankly, 1/4 is the OA. but your explanation was fantastic. thats why ..

Kudos [?]: 222 [0], given: 0

Manager
Joined: 28 Apr 2008
Posts: 110

Kudos [?]: 12 [0], given: 0

### Show Tags

31 Oct 2008, 08:57
the answer should be 1/4

after the first key is in the ring- there are 8 rings and thus 8 gaps to insert the second key.

if the second key sould be ajacent to the first, it could be inserted in only 2 gaps out of 8, thus probability of 2/8=1/4.

Kudos [?]: 12 [0], given: 0

Re: probability   [#permalink] 31 Oct 2008, 08:57

Go to page   Previous    1   2   [ 22 posts ]

Display posts from previous: Sort by

# There are 7 keys in a key ring. If two more keys are to be

 post reply Question banks Downloads My Bookmarks Reviews Important topics

 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®.