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!
TheUltimateWinner
Joined: 23 Feb 2015
Last visit: 06 Dec 2024
Posts: 2,509
Given Kudos: 1,984
Concentration: Finance, Technology
Schools: Harvard '24 Judge '23 LBS '24 McCombs '24 Mendoza Tepper '24 Ross '24 Cox Marshall '24 Fisher Kelley '24 Jones McDonough '24 Owen '24 Terry BU Simon '24 Katz GWU Mason Babson Gabelli Foster '24 Goizueta '24 Scheller Stern '23 CBS '23 Booth '23 Haas '25 Wharton '25 Stanford '26 Johnson'23 Fuqua '23 Kellogg '23 Kenan-Flagler'23 INSEAD Aug 22 intake Olin '23 Said '23 Sloan '23 Carey Arizona "22 Yale '23 UC Davis Madison '23 Anderson '23 Carroll Carlson '23 Darden '23
Schools: Harvard '24 Judge '23 LBS '24 McCombs '24 Mendoza Tepper '24 Ross '24 Cox Marshall '24 Fisher Kelley '24 Jones McDonough '24 Owen '24 Terry BU Simon '24 Katz GWU Mason Babson Gabelli Foster '24 Goizueta '24 Scheller Stern '23 CBS '23 Booth '23 Haas '25 Wharton '25 Stanford '26 Johnson'23 Fuqua '23 Kellogg '23 Kenan-Flagler'23 INSEAD Aug 22 intake Olin '23 Said '23 Sloan '23 Carey Arizona "22 Yale '23 UC Davis Madison '23 Anderson '23 Carroll Carlson '23 Darden '23
Posts: 2,509
19 May 2019, 10:33
Kudos
Bookmarks
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
23% (01:23) correct
77%
(01:10)
wrong
based on 82
sessions
History
Date
Time
Result
Not Attempted Yet
If \(N=(a^4)(b^3)+1\). Is N odd?
(1) \(a^4\) is even
(2) \(b^2\) is odd
(1) \(a^4\) is even
(2) \(b^2\) is odd
20 May 2019, 08:43
Kudos
Bookmarks
The question needs to state that a and b are integers. Assuming that's the case, then (a^4)(b^3) will be even or odd whenever ab is, respectively, even or odd. So the question is asking "is ab+1 odd?" which is the same as asking "is ab even?".
Using Statement 1, a is even, so ab is even. Using Statement 2, b is odd, so we don't know if ab is even -- that will depend on whether a is even or odd. So the answer is A.
If, however, a and b are not necessarily integers, then the answer is E, since we can't in that case even be sure N is an integer, let alone an odd integer.
Using Statement 1, a is even, so ab is even. Using Statement 2, b is odd, so we don't know if ab is even -- that will depend on whether a is even or odd. So the answer is A.
If, however, a and b are not necessarily integers, then the answer is E, since we can't in that case even be sure N is an integer, let alone an odd integer.
25 Nov 2019, 09:11
Kudos
Bookmarks
IanStewart
The question needs to state that a and b are integers. Assuming that's the case, then (a^4)(b^3) will be even or odd whenever ab is, respectively, even or odd. So the question is asking "is ab+1 odd?" which is the same as asking "is ab even?".
Using Statement 1, a is even, so ab is even. Using Statement 2, b is odd, so we don't know if ab is even -- that will depend on whether a is even or odd. So the answer is A.
If, however, a and b are not necessarily integers, then the answer is E, since we can't in that case even be sure N is an integer, let alone an odd integer.
Using Statement 1, a is even, so ab is even. Using Statement 2, b is odd, so we don't know if ab is even -- that will depend on whether a is even or odd. So the answer is A.
If, however, a and b are not necessarily integers, then the answer is E, since we can't in that case even be sure N is an integer, let alone an odd integer.
I agree with you. However, an even number by definition must be an integer (could you give me an example of an even number who is not an integer? the definition of even number is a number of the form n=2k where k is an integer). Therefore, should be A. I think this question is confusing in the way that is written and not something GMAT would test.
