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

It is currently 02 Sep 2015, 22:57
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

For a finite sequence of nonzero numbers, the number of

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
VP
VP
avatar
Joined: 22 Nov 2007
Posts: 1104
Followers: 8

Kudos [?]: 245 [0], given: 0

For a finite sequence of nonzero numbers, the number of [#permalink] New post 18 Dec 2007, 09:39
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

For a finite sequence of nonzero numbers, the number of variations in sign is defined as the number of pairs of consecutive terms in the sequence for which the product of the 2 consecutive term is negative. What is the number of varations in sign for the sequence 1, -3, 2, 5, -4, -6?

A. 1
B. 2
C. 3
D. 4
E. 5
Expert Post
CEO
CEO
User avatar
Joined: 17 Nov 2007
Posts: 3574
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 433

Kudos [?]: 2352 [0], given: 359

GMAT ToolKit User Premium Member
 [#permalink] New post 18 Dec 2007, 11:50
Expert's post
C

I think It is not combination.

1, -3, 2, 5, -4, -6
1, -3, 2, 5, -4, -6
1, -3, 2, 5, -4, -6
CEO
CEO
User avatar
Joined: 29 Mar 2007
Posts: 2585
Followers: 17

Kudos [?]: 260 [0], given: 0

Re: combinations? [#permalink] New post 19 Dec 2007, 14:34
marcodonzelli wrote:
For a finite sequence of nonzero numbers, the number of variations in sign is defined as the number of pairs of consecutive terms in the sequence for which the product of the 2 consecutive term is negative. What is the number of varations in sign for the sequence 1, -3, 2, 5, -4, -6?

A. 1
B. 2
C. 3
D. 4
E. 5


Im really confused by the definition of consecutive term here. b/c i dont see any real consecutive terms here at all.

but if we were suppose to consider real consecutive terms: -1,0,1 etc.. there wouldnt be any negative variations...

so it must mean terms such as this from the list above:

-6*5
-4*3
-3*2

essentially 6 comes after 5 and we just ignore then minus sign to apply the consecutive term... i prolly dont make much sense, but I think its C
Re: combinations?   [#permalink] 19 Dec 2007, 14:34
Display posts from previous: Sort by

For a finite sequence of nonzero numbers, the number of

  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®.