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.
May 1212:00 PM EDT
-11:59 PM EDT
Make the most of your break with the most realistic GMAT™ prep. Take up to $700 off select products.
May 1308:30 AM PDT
-09:30 AM PDT
In Episode 4 of our GMAT Ninja CR series, we tackle the most intimidating CR question type: Boldface & "Legalese" questions. If you've ever stared at an answer choice that reads, "The first is a consideration introduced to counter a position that...- May 14
08:30 AM PDT
-09:30 AM PDT
Most GMAT test-takers are intimidated by the hardest GMAT Verbal questions. In this session, Target Test Prep GMAT instructor Erika Tyler-John, a 100th percentile GMAT scorer, will show you how top scorers break down challenging Verbal questions..
10 Sep 2019, 11:34
Kudos
Bookmarks
D
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:
100% (00:56) correct
0%
(00:00)
wrong
based on 1
sessions
History
Date
Time
Result
Not Attempted Yet
Can the below be solved by taking the sum of the first (m1) and last (m10) number divided by the total numbers (10)?
For every integer m from 1 to 10 inclusive, the mthmth term of a certain sequence is given by (−1)(m+1)∗(12)m(−1)(m+1)∗(12)m. If T is the sum of the first 10 terms in the sequence, then T is:
(A) greater than 2
(B) between 1 and 2
(C) between 0.5 and 1
(D) between 0.25 and 0.5
(E) less than 0.25
There is an article from GMAT Economist that explains (but I can't post the article), can this be applied?
Example:
Applying the rules to find the sum of the sequence
How do we apply these useful rules to this question?
First, calculate the average of the first and last terms.
The first term is the sum of 1, 2 and 3 = 6
The last term is the sum of 99, 100 and 101 = 300
The average of the first and last terms = (6 + 300) / 2 = 306 / 2 = 153
Second, multiply the average by the number of terms.
There are 99 terms
Therefore, the answer to our question is 153 x 99
For every integer m from 1 to 10 inclusive, the mthmth term of a certain sequence is given by (−1)(m+1)∗(12)m(−1)(m+1)∗(12)m. If T is the sum of the first 10 terms in the sequence, then T is:
(A) greater than 2
(B) between 1 and 2
(C) between 0.5 and 1
(D) between 0.25 and 0.5
(E) less than 0.25
There is an article from GMAT Economist that explains (but I can't post the article), can this be applied?
Example:
Applying the rules to find the sum of the sequence
How do we apply these useful rules to this question?
First, calculate the average of the first and last terms.
The first term is the sum of 1, 2 and 3 = 6
The last term is the sum of 99, 100 and 101 = 300
The average of the first and last terms = (6 + 300) / 2 = 306 / 2 = 153
Second, multiply the average by the number of terms.
There are 99 terms
Therefore, the answer to our question is 153 x 99
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!
10 Sep 2019, 11:37
Kudos
Bookmarks
LTM24
Discussed here: for-every-integer-k-from-1-to-10-inclusive-the-kth-term-of-88874.html
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:
