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 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.
23 Apr 2023, 23:41
Kudos
Bookmarks
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
85%
(hard)
Question Stats:
49% (01:59) correct
51%
(02:12)
wrong
based on 192
sessions
History
Date
Time
Result
Not Attempted Yet
The data collected for 20 years of population surveys of a city C were analyzed. It was observed that population change follows a certain pattern such that \(\frac{a_n}{a_{(n-1)}} = r\) for n \(\geq 2\) where r is a positive constant and \(r \neq 1\) and \(a_n\) denotes the population in the nth year.
In how many of the first 13 years, the population of city C was lesser than 1000?
(1) \(a_{13} = 16900\)
(2) \(a_7 = 1000\)
In how many of the first 13 years, the population of city C was lesser than 1000?
(1) \(a_{13} = 16900\)
(2) \(a_7 = 1000\)
24 Apr 2023, 03:58
Kudos
Bookmarks
IMO B is the correct solution.
1) We know that in the 13th year, the population is 16900, however we have no information whether the population is increasing or decreasing ( r could be <1 or > 1). Not sufficient.
2) We know that in year 7, the population is 1000. We also know, because r is /= 1, that the population never stays the same. Therefore, for r <1 we know that in the first 13 years the population was smaller than 1000 for 7 years and for r > 1 we know that the population is smaller for (13-7) = 6 years.
Please correct me if I'm wrong.
1) We know that in the 13th year, the population is 16900, however we have no information whether the population is increasing or decreasing ( r could be <1 or > 1). Not sufficient.
2) We know that in year 7, the population is 1000. We also know, because r is /= 1, that the population never stays the same. Therefore, for r <1 we know that in the first 13 years the population was smaller than 1000 for 7 years and for r > 1 we know that the population is smaller for (13-7) = 6 years.
Please correct me if I'm wrong.
22 Apr 2024, 21:50
Kudos
Bookmarks
I think this question's answer is C.
You need to know if the population is increasing (K > 1) or decreasing (0 < K < 1). Without the knowledge in Statement 1, we don't know if it was 7 years (increasing) or 6 years (decreasing).
You need to know if the population is increasing (K > 1) or decreasing (0 < K < 1). Without the knowledge in Statement 1, we don't know if it was 7 years (increasing) or 6 years (decreasing).
