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 350,000 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:

few DS and PS questions.. [#permalink]
20 Aug 2007, 10:18

hey guys! thanks soo much for looking at this post.. i know these questions are easy for you guys, but i would really REALLY appreciate help! i feel i am lacking the basics.. lol

For every integer K from 1 to 10 inclusive, the Kth term of a sequence is given by:
(-1)^k+1 (1/2^k)
If T is the sum of the first 10 terms in the sequence, then T is:

OK so i plugged in 1 and got 1/4.. but i dont understand why the answer is between 1/4 and 1/2.. bc if I plug in 10.. doesnt (-1)^11 give us -1??

What function is f(a+b)=f(a)+f(b) for all positive numbers a+b?

I just really forget how functions work! so if someone could help me out here, that be wonderful! the answer is F(x)=-3x

If the speed of X meters/sec. is equivalent to the speed of Y km/hr. what is Y in terms of X?

3600000x

18x/5

5x/18

6x/5

60x

Just confused as to the best approach to set this question up.

Thanks again for all your help!! i have the GMAT in 7 days.. and i am mildly stressing! LOL!

For every integer K from 1 to 10 inclusive, the Kth term of a sequence is given by:
(-1)^k+1 (1/2^k)
If T is the sum of the first 10 terms in the sequence, then T is:

The first term is (-1)^2(1/2) = 1/2
The second term is (-1)^3(1/2) = -1/4
The third term is (-1)^4(1/8) = 1/8
The fourth term is (-1)^5(1/16) =-1/16

So we have on our hands a geometric progression with sum of term given as S =a(1-r^n)/(1-r)

So a = 1/2, r = -1/2, n = 10. S = 1/2(1-(-1/2)^10)/(1+1/2). The term (-1/2)^10 is going to be very big, so the S is close to (1/2)/(2/3) = 1/3 which is between 1/2 and 1/4.

Great to know you are joining Kellogg. A lot was being talked about your last minute interview on Pagalguy (all good though). It was kinda surprise that you got the...