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.
Mar 2511:00 AM PDT
-12:00 PM PDT
Dreaming about studying abroad but worried about finances? In this video, we provide overview of HDFC Credila's education loan offerings and insights into securing an education loan effortlessly.
Mar 1910:00 AM EDT
-11:59 PM EDT
Get a massive $250 off the TTP OnDemand GMAT course by using the coupon code FLASH25 at checkout. If you prefer learning through engaging video lessons, TTP OnDemand GMAT is exactly what you need.- Mar 24
08:30 AM PDT
-09:30 AM PDT
Join 99th percentile Manhattan Prep Instructor, Ryan Starr, for the third session in our three-part series on how to maximize your study effectiveness. The new GMAT tests comprehension, analysis, and logic, and more. - Mar 26
10:00 AM PDT
-11:00 AM PDT
Confused about how to get the most from your GMAT mock tests? In this video, learn the perfect strategy to analyze GMAT mocks effectively and boost your score. We break down the common mistakes GMAT aspirants make when using mock tests 
Mar 2610:00 AM EDT
-11:59 PM EDT
The Target Test Prep GMAT Flash Sale is LIVE! Get 25% off our game-changing course and save up to $400 today! Use code FLASH25 at checkout. This limited-time deal won’t last long, so grab your discount now!- Mar 27
09:30 AM PDT
-10:30 AM PDT
Preparing for the GMAT? Avoid these 5 major mistakes that can lower your score and hurt your MBA dreams. In this expert panel discussion, 4 top GMAT coaches - GMAT Ninja, Jeff Miller from TTP, Rida Shafiq from eGMAT, and Chris Gentry from Manhattan Prep - Mar 27
10:00 AM PDT
-11:00 AM PDT
What happens after getting an MBA? Is it worth the investment? To find out, I interviewed 10 GMAT Club professionals who have completed their MBAs and built careers in consulting, finance, tech, and entrepreneurship. Their answers might surprise you! 
Mar 2911:30 AM EDT
-12:30 PM EDT
Learn how Keshav, a Chartered Accountant, scored an impressive 705 on GMAT in just 30 days with GMATWhiz's expert guidance. In this video, he shares preparation tips and strategies that worked for him, including the mock, time management, and more.
Mar 3011:00 AM IST
-01:00 PM IST
Attend this session to evaluate your current skill level, learn process skills, and solve through tough Arithmetic questions.
27 Jan 2024, 10:03
Kudos
Bookmarks
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
66% (01:44) correct
34%
(01:43)
wrong
based on 756
sessions
History
Date
Time
Result
Not Attempted Yet
An airline serving n cities has 2 nonstop flights per day, one in each direction, between each pair of these cities. How many nonstop flights does the airline have among these n cities each day?
A. 2n(n-1)
B. n(n-1)
C. 2n^2
D. n^2
E. 2n
2024-01-27_20-58-23.png [ 37.25 KiB | Viewed 10522 times ]
A. 2n(n-1)
B. n(n-1)
C. 2n^2
D. n^2
E. 2n
Attachment:
2024-01-27_20-58-23.png [ 37.25 KiB | Viewed 10522 times ]
27 Jan 2024, 10:11
Kudos
Bookmarks
guddo
An airline serving n cities has 2 nonstop flights per day, one in each direction, between each pair of these cities. How many nonstop flights does the airline have among these n cities each day?
A. 2n(n-1)
B. n(n-1)
C. 2n^2
D. n^2
E. 2n
A. 2n(n-1)
B. n(n-1)
C. 2n^2
D. n^2
E. 2n
Attachment:
2024-01-27_20-58-23.png
From n cities, we can form \(C^2_n=\frac{n!}{2!(n-2)!}=\frac{(n-2)!(n-1)n}{2!(n-2)!}=\frac{(n-1)n}{2}\) pairs. Since there are 2 flights between each pair of cities, the total number of flights among n cities is \(2*\frac{(n-1)n}{2}=(n-1)n\).
Answer: B.
General Discussion
27 Jan 2024, 11:24
Kudos
Bookmarks
guddo
An airline serving n cities has 2 nonstop flights per day, one in each direction, between each pair of these cities. How many nonstop flights does the airline have among these n cities each day?
A. 2n(n-1)
B. n(n-1)
C. 2n^2
D. n^2
E. 2n
A. 2n(n-1)
B. n(n-1)
C. 2n^2
D. n^2
E. 2n
Attachment:
2024-01-27_20-58-23.png
One way to solve this question is by using the concept of Permutations and Combinations as Bunuel has depicted.
Another way is to assume a value of n and then eliminate the options.
Assume n = 2
The number of flights nonstop flights the airline has among these 2 cities ⇒ is 2 (one flight from City 1 to City 2 and another from City 2 to City 1
Answer choice elimination
A. 2n(n-1) ⇒ 2 * 2 (1) = 4
B. n(n-1) ⇒ 2 * 1 = 2
C. 2n^2 ⇒ 2*2^2 = 8
D. n^2 ⇒ 2^2 = 4
E. 2n ⇒ 2 * 2 = 4
Option B
