Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Apr 2512:30 AM EDT
-01:30 AM EDT
At one point, she believed GMAT wasn’t for her. After scoring 595, self-doubt crept in and she questioned her potential. But instead of quitting, she made the right strategic changes. The result? A remarkable comeback to 695. Check out how Saakshi did it.
Apr 2610:00 AM EDT
-11:00 AM EDT
The Target Test Prep course represents a quantum leap forward in GMAT preparation, a radical reinterpretation of the way that students should study. Try before you buy with a 5-day, full-access trial of the course for FREE!
Apr 2711:00 AM EDT
-12:00 PM EDT
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors
Apr 2808:00 AM PDT
-11:00 AM PDT
Whether you are just beginning your MBA journey or fine-tuning your path to a 700+ score, GMAT Day is designed to give you a competitive edge.
02 Apr 2015, 15:39
Kudos
Bookmarks
A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
(N/A)
Question Stats:
50% (01:00) correct
50%
(01:24)
wrong
based on 2
sessions
History
Date
Time
Result
Not Attempted Yet
Given the following: x1 = 2, x2 = -1, x3 = -2, x4 = 5, x5 = -4, x6 = 8, find
A. 7
B. 9
C. 11
D. 20
E. 26
Attachment:
Eq.png
A. 7
B. 9
C. 11
D. 20
E. 26
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
02 Apr 2015, 16:22
Kudos
Bookmarks
goodyear2013
Dear goodyear2013,
I'm happy to respond.
With all due respect, I believe something is amiss with how you posted the problem. The equation you posted in the picture has a clear value, although not the one you report as the OA. What is entirely cryptic to me is the first line, "Given the following: x1 = 2, etc." That doesn't appear to have any connection to the equation at all or to anything actually asked. There are no x's in the equation that is to be evaluated. Something is very fishy here. Were two different problems conflated? The expression you have in the picture is a summation symbol. This symbol appears frequently in advanced mathematics, but I have never seen it in a GMAT problem. It's actually not that hard, but I have never see the GMAT refer to it.
\(\sum_{i=1}^{3} (i^2 + 2i)\)
means that we are going to plug the values i = 1, i = 2, and i = 3 into that algebraic expression, \((i^2 + 2i)\), which will give us three values, and then we are going to add those three values up.
When i = 1, \((i^2 + 2i)= 1 + 2 = 3\)
When i = 2, \((i^2 + 2i)= 4 + 4 = 8\)
When i = 3, \((i^2 + 2i)= 9 + 6 = 15\)
3 + 8 + 15 = 26
This is choice (E), but does not match the OA you listed. Once again, this is not math you would need to know for the GMAT.
Please let me know where you found this problem and any corrections to it.
Mike
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
Moderator:
