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 2301:30 AM EDT
-02:30 AM EDT
Struggling with GMAT Verbal as a non-native speaker? Harsh improved his score from 595 to 695 in just 45 days—and scored a 99 %ile in Verbal (V88)! Learn how smart strategy, clarity, and guided prep helped him gain 100 points.
Apr 2308:00 PM PDT
-09:00 PM PDT
Video explanations + diagnosis of 10 weakest areas + 150+ short videos + study plan!
Apr 2212:30 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.
28 May 2011, 17:02
Kudos
Bookmarks
N
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:
86% (01:17) correct
14%
(00:44)
wrong
based on 25
sessions
History
Date
Time
Result
Not Attempted Yet
In a series of 10 numbers the addition of all 10 numbers is 3069 and each number is two times the previous one. What is the value of the 3rd number?
Just expecting to figure out another way to do it... maybe faster
Just expecting to figure out another way to do it... maybe faster
ans: 12
28 May 2011, 18:24
Kudos
Bookmarks
we know the series, its 2^0x, 2^1x, 2^2x, .... 2^10x
i think the other way to solve this is -
geometric progression, sum of 10 numbers = a (1-r^n)/1-r
3069 = 2^0 x (1-2^10)/1-2
solving it for x, x = 3
2^2x = 12
i think the other way to solve this is -
geometric progression, sum of 10 numbers = a (1-r^n)/1-r
3069 = 2^0 x (1-2^10)/1-2
solving it for x, x = 3
2^2x = 12
29 May 2011, 02:35
Kudos
Bookmarks
Sum of a GP = a(r^n - 1)/(r - 1)
r = 2, n = 10
3069 = a(2^10 - 1)/(2-1)
=> a = 3069/1023 = 3
=> 3rd term = 3 * 2^2 = 12
r = 2, n = 10
3069 = a(2^10 - 1)/(2-1)
=> a = 3069/1023 = 3
=> 3rd term = 3 * 2^2 = 12
