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

It is currently 03 Aug 2015, 09:44
GMAT Club Tests

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

2 slips drawn

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
avatar
Joined: 04 Dec 2008
Posts: 106
Followers: 1

Kudos [?]: 88 [0], given: 2

2 slips drawn [#permalink] New post 16 Jul 2009, 02:03
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Each of the integers from 0 to 9, inclusive, is written on a separate slip of blank paper and the ten slips are dropped into a hat. If the slips are then drawn one at a time without replacement, how many must be drawn to ensure that the numbers on two of the slips drawn will have a sum of 10?

(A) Three
(B) Four
(C) Five
(D) Six
(E) Seven
Senior Manager
Senior Manager
avatar
Joined: 23 Jun 2009
Posts: 354
Location: Turkey
Schools: UPenn, UMich, HKS, UCB, Chicago
Followers: 5

Kudos [?]: 98 [0], given: 63

Re: 2 slips drawn [#permalink] New post 16 Jul 2009, 02:11
It is an "at least" question. So it wants us a number that guarantees the solution.
So take the worst case;
First you take 0
Second you take 1
...
...
Sixth you take 5 (This does not gives us the solution)
Seventh you take 6 (this guarantees the solution)
i.e. even in worst case one can find the solution in 7 steps. So 7 steps guarantees.

E
Manager
Manager
avatar
Joined: 04 Dec 2008
Posts: 106
Followers: 1

Kudos [?]: 88 [0], given: 2

Re: 2 slips drawn [#permalink] New post 06 Aug 2009, 03:20
maliyeci wrote:
It is an "at least" question. So it wants us a number that guarantees the solution.
So take the worst case;
First you take 0
Second you take 1
...
...
Sixth you take 5 (This does not gives us the solution)
Seventh you take 6 (this guarantees the solution)
i.e. even in worst case one can find the solution in 7 steps. So 7 steps guarantees.

E


Thanks! I understand.
Re: 2 slips drawn   [#permalink] 06 Aug 2009, 03:20
Display posts from previous: Sort by

2 slips drawn

  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®.