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

It is currently 20 Sep 2018, 00:08

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

Is ABC an odd integer?

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Manager
Manager
User avatar
G
Joined: 01 Sep 2016
Posts: 198
GMAT 1: 690 Q49 V35
GMAT ToolKit User Reviews Badge
Is ABC an odd integer?  [#permalink]

Show Tags

New post Updated on: 19 Sep 2017, 11:00
1
3
00:00
A
B
C
D
E

Difficulty:

  75% (hard)

Question Stats:

33% (00:50) correct 67% (00:42) wrong based on 83 sessions

HideShow timer Statistics

Is ABC an odd integer?

1. AB is an even integer
2. BC is an even integer

_________________

we shall fight on the beaches,
we shall fight on the landing grounds,
we shall fight in the fields and in the streets,
we shall fight in the hills;
we shall never surrender!


Originally posted by bkpolymers1617 on 17 Sep 2017, 12:48.
Last edited by bkpolymers1617 on 19 Sep 2017, 11:00, edited 1 time in total.
Manager
Manager
User avatar
G
Joined: 01 Sep 2016
Posts: 198
GMAT 1: 690 Q49 V35
GMAT ToolKit User Reviews Badge
Re: Is ABC an odd integer?  [#permalink]

Show Tags

New post 17 Sep 2017, 12:52
Bunuel : Can you help? I don't have the official explanation, but believe that the answer is C. Please let me know if that is correct. I can prove it, but it would be great if it comes from an expert. Thanks
_________________

we shall fight on the beaches,
we shall fight on the landing grounds,
we shall fight in the fields and in the streets,
we shall fight in the hills;
we shall never surrender!

Intern
Intern
avatar
B
Joined: 16 Jul 2017
Posts: 4
Re: Is ABC an odd integer?  [#permalink]

Show Tags

New post 17 Sep 2017, 14:59
IMO, Answer should be D.

1. St. 1 - AB is even - A term of the form (even no. * X ) will always be even. Hence , its even. Suff.
2. St 2- BC is even - same - Suff.

Kudos, if it helps.
Manager
Manager
User avatar
G
Joined: 01 Sep 2016
Posts: 198
GMAT 1: 690 Q49 V35
GMAT ToolKit User Reviews Badge
Re: Is ABC an odd integer?  [#permalink]

Show Tags

New post 17 Sep 2017, 20:23
D can not be tge answer. You are assuming that A, B and C are integers which is not true. Can be fractions as well, in which case, we will get scenarios in which they are not integers. So choice d is 100% incorrect
_________________

we shall fight on the beaches,
we shall fight on the landing grounds,
we shall fight in the fields and in the streets,
we shall fight in the hills;
we shall never surrender!

Manager
Manager
User avatar
G
Joined: 01 Sep 2016
Posts: 198
GMAT 1: 690 Q49 V35
GMAT ToolKit User Reviews Badge
Re: Is ABC an odd integer?  [#permalink]

Show Tags

New post 19 Sep 2017, 10:12
1
Hey Everyone, so here is the explanation:

1. AB is even- Insufficient. Say AB=2, and C =3/2, then ABC is what ? An odd number. Now take another scenario, take AB=4, C=6. ABC is what? An even number. Hence insufficient. Those who assumed that C is an integer must have believed that A is sufficient.

2. BC is even- Insufficient. Say BC=2, and A = 3/2, then ABC is what ? An odd number. Now take another scenario, take BC=4, A=6. ABC is what? An even number. Hence insufficient. Those who assumed that A is an integer must have believed that B is sufficient.

Now combined, we are sure that one of the 3 numbers is surely an integer. If you multiply ABC in any way, you will have only 2 situations-
1. either ABC is not an integer itself
2. Or ABC is an even integer.

But in no case, would ABC be an odd integer. Hence C is the answer
_________________

we shall fight on the beaches,
we shall fight on the landing grounds,
we shall fight in the fields and in the streets,
we shall fight in the hills;
we shall never surrender!

Director
Director
avatar
G
Joined: 21 May 2013
Posts: 649
Re: Is ABC an odd integer?  [#permalink]

Show Tags

New post 19 Sep 2017, 10:56
bkpolymers1617 wrote:
Is ABC an odd integer?

1. AB is an even integer
2. BC is an even integer



C cant be the answer. The answer should be E

Let us take 2 cases
Case 1. a=1/2,b=4, c=1/2
Case 2 a=1/2, b=8., c=1/2

Now use both the statements,

One of the cases will be even integer and other will give odd.
Manager
Manager
User avatar
G
Joined: 01 Sep 2016
Posts: 198
GMAT 1: 690 Q49 V35
GMAT ToolKit User Reviews Badge
Re: Is ABC an odd integer?  [#permalink]

Show Tags

New post 19 Sep 2017, 10:59
KS15 wrote:
bkpolymers1617 wrote:
Is ABC an odd integer?

1. AB is an even integer
2. BC is an even integer



C cant be the answer. The answer should be E

Let us take 2 cases
Case 1. a=1/2,b=4, c=1/2
Case 2 a=1/2, b=8., c=1/2

Now use both the statements,

One of the cases will be even integer and other will give odd.



Thanks for posting this. I ll correct this. I had asked the experts, but since there was no revert, I gave my thoughts. I ll change the OA. Thanks
_________________

we shall fight on the beaches,
we shall fight on the landing grounds,
we shall fight in the fields and in the streets,
we shall fight in the hills;
we shall never surrender!

Senior Manager
Senior Manager
avatar
G
Joined: 02 Apr 2014
Posts: 477
GMAT 1: 700 Q50 V34
Is ABC an odd integer?  [#permalink]

Show Tags

New post 26 Nov 2017, 03:58
Answer should be E

Statement 1: Both A and B could be integers, we don't know about C -> InSuff
For eg A = 3, B = 2 OR A = 1/3 , B = 6 => AB is even integer

Statement 2: Both B and C could be integers, we don't know about A -> InSuff
For eg B = 3, C = 2 OR C = 1/3 , B = 6 => BC is even integer

(1)+(2), A,B, C could be integers in that case, ABC is even integer
OR
A = 1/3, B = 6, C = 1/3 => ABC = 6/9 is not even an integer

Answer (E)
Is ABC an odd integer? &nbs [#permalink] 26 Nov 2017, 03:58
Display posts from previous: Sort by

Is ABC an odd integer?

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

Events & Promotions

PREV
NEXT


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®.