Forum Home > GMAT > Quantitative > Problem Solving (PS)
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.
Dec 1310:00 AM EST
-12:00 PM EST
Have you ever wondered how to score a PERFECT 805 on the GMAT? Meet Julia, a banking professional who used the Target Test Prep course to achieve this incredible feat. Julia's story is nothing short of an inspiration.
Dec 1410:00 AM EST
-12:00 PM EST
Think a 100% GMAT Verbal score is out of your reach? Target Test Prep will make you think again! Our course uses techniques such as topical study and spaced repetition to maximize knowledge retention and make studying simple and fun.
Dec 1411:00 AM IST
-01:00 PM IST
Attend this session to learn how to Deconstruct arguments, Pre-Think Author’s Assumptions, and apply Negation Test.- Dec 15
11:00 AM IST
-01:00 PM IST
Attend this free GMAT Algebra Webinar and learn how to master the most challenging Inequalities and Absolute Value problems with ease. 
Dec 1608:00 AM PST
-11:59 PM PST
GMAT Club 12 Days of Christmas is a 4th Annual GMAT Club Winter Competition based on solving questions. This is the Winter GMAT competition on GMAT Club with an amazing opportunity to win over $40,000 worth of prizes!
11 Aug 2016, 06:57
Kudos
Bookmarks
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
69% (00:41) correct
31%
(00:39)
wrong
based on 194
sessions
History
Date
Time
Result
Not Attempted Yet
11 Aug 2016, 08:01
Kudos
Bookmarks
(1) s^2 = r^2 : s and r can be positive or negative - not sufficient
(2) s is positive: No info about r .
Combined together, still no info about r whether r is positive or negative.
Hence E
(2) s is positive: No info about r .
Combined together, still no info about r whether r is positive or negative.
Hence E
11 Aug 2016, 09:50
Kudos
Bookmarks
Bunuel
Is s = r?
(1) s² = r²
(2) s is positive
(1) s² = r²
(2) s is positive
Target question: Is s = r?
Statement 1: s² = r²
When we square a number, the result is always greater than or equal to zero. So, this statement doesn't FEEL sufficient. As such, let's TEST some values.
There are several values of x and y that satisfy statement 1. Here are two:
Case a: s = 1 and r = 1, in which case s = r
Case b: s = 1 and r = -1, in which case s ≠ r
Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT
Aside: For more on this idea of plugging in values when a statement doesn't feel sufficient, you can read my article: https://www.gmatprepnow.com/articles/dat ... lug-values
Statement 2: s is positive
Without information about r, there's no way answer the target question with certainty.
So, statement 2 is NOT SUFFICIENT
Statements 1 and 2 combined
There are several values of x and y that satisfy BOTH statements. Here are two:
Case a: s = 1 and r = 1, in which case s = r
Case b: s = 1 and r = -1, in which case s ≠ r
Since we can answer the target question with certainty, the combined statements are NOT SUFFICIENT
Answer =
Cheers,
Brent
