GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 18 Jan 2019, 22:23

Close

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

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel
Events & Promotions in January
PrevNext
SuMoTuWeThFrSa
303112345
6789101112
13141516171819
20212223242526
272829303112
Open Detailed Calendar
  • Free GMAT Strategy Webinar

     January 19, 2019

     January 19, 2019

     07:00 AM PST

     09:00 AM PST

    Aiming to score 760+? Attend this FREE session to learn how to Define your GMAT Strategy, Create your Study Plan and Master the Core Skills to excel on the GMAT.
  • FREE Quant Workshop by e-GMAT!

     January 20, 2019

     January 20, 2019

     07:00 AM PST

     07:00 AM PST

    Get personalized insights on how to achieve your Target Quant Score.

Quantitative OG 2019 Question No 36

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Intern
Intern
avatar
Joined: 14 Mar 2017
Posts: 1
Quantitative OG 2019 Question No 36  [#permalink]

Show Tags

New post 27 Dec 2018, 01:06
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

60% (00:36) correct 40% (00:25) wrong based on 5 sessions

HideShow timer Statistics

If X and Y are integers and X-Y is odd, which of the following must be true?
1. XY is even
2. X2 + Y2 is odd
3.(X+Y)2 is even

(A) 1 only
(B) 2 only
(C) 3 only
(D) 1 and 2 only
(E) 1, 2 and 3

Official answer is (D)

Question can be solved easily by taking one integer odd and the other one even. like (5,4)
and answer comes out to be D
But my question is
What if I take (1,0) as X,Y
Both the conditions are met
1,0 both are integers
1-0 = odd
Then (D) comes out to be wrong
Then (B) would be correct.
Please help
Thanks


Posted from my mobile device
Intern
Intern
avatar
B
Joined: 16 Nov 2016
Posts: 10
Concentration: International Business, Marketing
Re: Quantitative OG 2019 Question No 36  [#permalink]

Show Tags

New post 27 Dec 2018, 01:38
aashishlandmark wrote:
If X and Y are integers and X-Y is odd, which of the following must be true?
1. XY is even
2. X2 + Y2 is odd
3.(X+Y)2 is even

(A) 1 only
(B) 2 only
(C) 3 only
(D) 1 and 2 only
(E) 1, 2 and 3

Official answer is (D)

Question can be solved easily by taking one integer odd and the other one even. like (5,4)
and answer comes out to be D
But my question is
What if I take (1,0) as X,Y
Both the conditions are met
1,0 both are integers
1-0 = odd
Then (D) comes out to be wrong
Then (B) would be correct.
Please help
Thanks

Posted from my mobile device


Hi ,In the case of 1 and 0

1. 1*0= 0 which is even,hence 1 is correct
2. 1*2 + 0*2=2 = even,hence incorrect.

can you post the solution please?
Intern
Intern
avatar
B
Joined: 17 Jul 2017
Posts: 19
Re: Quantitative OG 2019 Question No 36  [#permalink]

Show Tags

New post 27 Dec 2018, 01:53
sidjain93 wrote:
aashishlandmark wrote:
If X and Y are integers and X-Y is odd, which of the following must be true?
1. XY is even
2. X2 + Y2 is odd
3.(X+Y)2 is even

(A) 1 only
(B) 2 only
(C) 3 only
(D) 1 and 2 only
(E) 1, 2 and 3

Official answer is (D)

Question can be solved easily by taking one integer odd and the other one even. like (5,4)
and answer comes out to be D
But my question is
What if I take (1,0) as X,Y
Both the conditions are met
1,0 both are integers
1-0 = odd
Then (D) comes out to be wrong
Then (B) would be correct.
Please help
Thanks

Posted from my mobile device


Hi ,In the case of 1 and 0

1. 1*0= 0 which is even,hence 1 is correct
2. 1*2 + 0*2=2 = even,hence incorrect.

can you post the solution please?


In option 2 X2+ Y2 means X^2+Y^2 not X*2+Y*2
_________________

I am alive, because I have a dream
Give kudos if it helped. Comment if I am wrong to help me learn more.

Manager
Manager
User avatar
G
Status: In last prep stage
Joined: 11 Jun 2017
Posts: 151
GMAT 1: 630 Q44 V33
GMAT 2: 680 Q47 V37
GPA: 3.2
Premium Member
Re: Quantitative OG 2019 Question No 36  [#permalink]

Show Tags

New post 27 Dec 2018, 02:10
This question is already discussed here.
https://gmatclub.com/forum/if-x-and-y-a ... 71954.html
Please search before posting and follow rules- https://gmatclub.com/forum/rules-for-po ... 33935.html.
_________________

Thanks,
Ankit
Target Score:730+

If the post was useful,please send the kudos

GMAT Club Bot
Re: Quantitative OG 2019 Question No 36 &nbs [#permalink] 27 Dec 2018, 02:10
Display posts from previous: Sort by

Quantitative OG 2019 Question No 36

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.