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.
It appears that you are browsing the GMAT Club forum unregistered!
Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club
Registration gives you:
Tests
Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.
Applicant Stats
View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more
Books/Downloads
Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!
Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
I run into this problem and have no clue what to do and how [#permalink]
28 Sep 2008, 15:15
This topic is locked. If you want to discuss this question please re-post it in the respective forum.
I run into this problem and have no clue what to do and how to approach it (if you answer please explain the steps)
For a finite sequence of nonzero numbers, the number of variations in sign is defined as the number of pairs of consecutive terms of the sequence for which the product of the two consecutive terms is negative. What is the number of variations in sign for the sequence 1, -3, 2, 5, -4, -6 ?
one two three four five _________________
The one who flies is worthy. The one who is worthy flies. The one who doesn't fly isn't worthy
Re: Sequence problem - Nightmare [#permalink]
28 Sep 2008, 17:36
For a finite sequence of nonzero numbers, the number of variations in sign is defined as the number of pairs of consecutive terms of the sequence for which the product of the two consecutive terms is negative. What is the number of variations in sign for the sequence 1, -3, 2, 5, -4, -6 ?
one two three four five
The answer is three: (1*-3)=-3 negative (-3*2)=-6 negative (2*5)=10 positive (5*-4)=-20 negative (-4*-6)=24 positive 3 Negative products of consecutive terms
Re: Sequence problem - Nightmare [#permalink]
28 Sep 2008, 20:58
bertlacy wrote:
For a finite sequence of nonzero numbers, the number of variations in sign is defined as the number of pairs of consecutive terms of the sequence for which the product of the two consecutive terms is negative. What is the number of variations in sign for the sequence 1, -3, 2, 5, -4, -6 ?
one two three four five
The answer is three: (1*-3)=-3 negative (-3*2)=-6 negative (2*5)=10 positive (5*-4)=-20 negative (-4*-6)=24 positive 3 Negative products of consecutive terms
Agree that 3 is correct.
gmatclubot
Re: Sequence problem - Nightmare
[#permalink]
28 Sep 2008, 20:58