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

 It is currently 17 Dec 2018, 06:37

# R1 Decisions:

Michigan Ross Chat (US calls are expected today)  |  UCLA Anderson Chat  (Calls expected to start at 7am PST; Applicants from Asia will hear first)

### 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

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

## Events & Promotions

###### Events & Promotions in December
PrevNext
SuMoTuWeThFrSa
2526272829301
2345678
9101112131415
16171819202122
23242526272829
303112345
Open Detailed Calendar
• ### 10 Keys to nail DS and CR questions

December 17, 2018

December 17, 2018

06:00 PM PST

07:00 PM PST

Join our live webinar and learn how to approach Data Sufficiency and Critical Reasoning problems, how to identify the best way to solve each question and what most people do wrong.
• ### R1 Admission Decisions: Estimated Decision Timelines and Chat Links for Major BSchools

December 17, 2018

December 17, 2018

10:00 PM PST

11:00 PM PST

From Dec 5th onward, American programs will start releasing R1 decisions. Chat Rooms: We have also assigned chat rooms for every school so that applicants can stay in touch and exchange information/update during decision period.

# The symbol Ω represents one of the following operations: add

Author Message
TAGS:

### Hide Tags

Intern
Status: Yes, I can and I will. 700+FTW
Joined: 30 Sep 2013
Posts: 20
Location: India
Concentration: Finance, Strategy
GMAT Date: 02-05-2014
GPA: 3.7
WE: Other (Retail)

### Show Tags

Updated on: 29 Dec 2013, 02:38
2
7
00:00

Difficulty:

35% (medium)

Question Stats:

53% (00:35) correct 47% (00:33) wrong based on 419 sessions

### HideShow timer Statistics

The symbol Ω represents one of the following operations: addition, subtraction, multiplication or division. What is the value of 1 Ω 1?

(1) 2 Ω 2 = 4

(2) 0 Ω 1 = 0

Taken from Magoosh Practice question

Can anyone tell me why it isn't E?

_________________

It takes time before all the things work together.

Originally posted by ROckHIsT on 29 Dec 2013, 02:30.
Last edited by Bunuel on 29 Dec 2013, 02:38, edited 1 time in total.
Renamed the topic and edited the question.
Math Expert
Joined: 02 Sep 2009
Posts: 51261
Re: The symbol Ω represents one of the following operations: add  [#permalink]

### Show Tags

29 Dec 2013, 02:41
1
1
rgyanani wrote:
The symbol Ω represents one of the following operations: addition, subtraction, multiplication or division. What is the value of 1 Ω 1?

(1) 2 Ω 2 = 4

(2) 0 Ω 1 = 0

Taken from Magoosh Practice question

Can anyone tell me why it isn't E?

The symbol Ω represents one of the following operations: addition, subtraction, multiplication or division. What is the value of 1 Ω 1?

(1) 2 Ω 2 = 4. This implies that Ω represents addition or multiplication (2+2=4 and 2*2=4). If its addition, then 1 Ω 1 = 1 + 1 = 2 but if its multiplication, then 1 Ω 1 = 1*1 = 1. Not sufficient.

(2) 0 Ω 1 = 0. This implies that Ω represents multiplication or division. In either case 1 Ω 1 = 1. Sufficient.

Hope it's clear.
_________________
Math Expert
Joined: 02 Sep 2009
Posts: 51261
Re: The symbol Ω represents one of the following operations: add  [#permalink]

### Show Tags

29 Dec 2013, 02:41
Bunuel wrote:
rgyanani wrote:
The symbol Ω represents one of the following operations: addition, subtraction, multiplication or division. What is the value of 1 Ω 1?

(1) 2 Ω 2 = 4

(2) 0 Ω 1 = 0

Taken from Magoosh Practice question

Can anyone tell me why it isn't E?

The symbol Ω represents one of the following operations: addition, subtraction, multiplication or division. What is the value of 1 Ω 1?

(1) 2 Ω 2 = 4. This implies that Ω represents addition or multiplication (2+2=4 and 2*2=4). If its addition, then 1 Ω 1 = 1 + 1 = 2 but if its multiplication, then 1 Ω 1 = 1*1 = 1. Not sufficient.

(2) 0 Ω 1 = 0. This implies that Ω represents multiplication or division. In either case 1 Ω 1 = 1. Sufficient.

Hope it's clear.

Similar questions to practice:
if-represents-one-of-the-operations-and-x-is-k-l-m-144138.html
if-the-operation-is-one-of-the-four-arithmetic-operations-101283.html
if-the-operation-is-one-of-the-four-arithmetic-operations-93966.html
the-symbol-represents-one-of-the-four-arithmetic-operation-107575.html
if-represents-one-of-the-operations-and-is-a-101337.html
the-operation-x-n-for-all-positive-integers-greater-than-99064.html
if-represents-one-of-the-operations-and-x-is-k-l-m-144138.html
if-the-symbol-represents-one-of-the-following-operations-161138.html
the-symbol-represents-one-of-the-following-operations-161432.html

Hope it helps.
_________________
Intern
Status: Yes, I can and I will. 700+FTW
Joined: 30 Sep 2013
Posts: 20
Location: India
Concentration: Finance, Strategy
GMAT Date: 02-05-2014
GPA: 3.7
WE: Other (Retail)
Re: The symbol Ω represents one of the following operations: add  [#permalink]

### Show Tags

Updated on: 29 Dec 2013, 02:54
Thanks Bunnel, I forgot that the expression always needs to satisfy 1Ω1=1.

Bunuel wrote:
rgyanani wrote:
The symbol Ω represents one of the following operations: addition, subtraction, multiplication or division. What is the value of 1 Ω 1?

(1) 2 Ω 2 = 4

(2) 0 Ω 1 = 0

Taken from Magoosh Practice question

Can anyone tell me why it isn't E?

The symbol Ω represents one of the following operations: addition, subtraction, multiplication or division. What is the value of 1 Ω 1?

(1) 2 Ω 2 = 4. This implies that Ω represents addition or multiplication (2+2=4 and 2*2=4). If its addition, then 1 Ω 1 = 1 + 1 = 2 but if its multiplication, then 1 Ω 1 = 1*1 = 1. Not sufficient.

(2) 0 Ω 1 = 0. This implies that Ω represents multiplication or division. In either case 1 Ω 1 = 1. Sufficient.

Hope it's clear.

_________________

It takes time before all the things work together.

Originally posted by ROckHIsT on 29 Dec 2013, 02:44.
Last edited by ROckHIsT on 29 Dec 2013, 02:54, edited 1 time in total.
Math Expert
Joined: 02 Sep 2009
Posts: 51261
Re: The symbol Ω represents one of the following operations: add  [#permalink]

### Show Tags

29 Dec 2013, 02:50
rgyanani wrote:
Thanks Bunnel, I didn't knew the concept where the expression always needs to satisfy 1Ω1=1.

Bunuel wrote:
rgyanani wrote:
The symbol Ω represents one of the following operations: addition, subtraction, multiplication or division. What is the value of 1 Ω 1?

(1) 2 Ω 2 = 4

(2) 0 Ω 1 = 0

Taken from Magoosh Practice question

Can anyone tell me why it isn't E?

The symbol Ω represents one of the following operations: addition, subtraction, multiplication or division. What is the value of 1 Ω 1?

(1) 2 Ω 2 = 4. This implies that Ω represents addition or multiplication (2+2=4 and 2*2=4). If its addition, then 1 Ω 1 = 1 + 1 = 2 but if its multiplication, then 1 Ω 1 = 1*1 = 1. Not sufficient.

(2) 0 Ω 1 = 0. This implies that Ω represents multiplication or division. In either case 1 Ω 1 = 1. Sufficient.

Hope it's clear.

The question asks to find the value of 1 Ω 1.

From (1) we have that Ω represents addition or multiplication, which gives two different values of 1 Ω 1. Therefore (1) is NOT sufficient.
From (2) we have that Ω represents multiplication or division, which gives single numerical value of 1 Ω 1. Therefore (2) IS sufficient.

Hope it's clear.
_________________
CEO
Joined: 11 Sep 2015
Posts: 3241
Re: The symbol Ω represents one of the following operations: add  [#permalink]

### Show Tags

02 Oct 2018, 06:34
Top Contributor
ROckHIsT wrote:
The symbol Ω represents one of the following operations: addition, subtraction, multiplication or division. What is the value of 1 Ω 1?

(1) 2 Ω 2 = 4

(2) 0 Ω 1 = 0

Target question: What is the value of 1 Ω 1?

Given: Ω represents one of the following operations: addition, subtraction, multiplication or division.

Statement 1: 2 Ω 2 = 4
2 - 2 = 0, so Ω CANNOT represent subtraction.
2 ÷ 2 = 1, so Ω CANNOT represent division.
2 + 2 = 4, so Ω COULD represent addition. In this case, the answer to the target question is 1 Ω 1 = 1 + 1 = 2
2 x 2 = 4, so Ω COULD represent multiplication. In this case, the answer to the target question is 1 Ω 1 = 1 x 1 = 1
Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT

Statement 2: 0 Ω 1 = 0
0 - 1 = -1, so Ω CANNOT represent subtraction.
0 ÷ 1 = 0, so Ω COULD represent division. In this case, the answer to the target question is 1 Ω 1 = 1 ÷ 1 = 1
0 + 1 = 1, so Ω CANNOT represent addition.
0 x 1 = 0, so Ω COULD represent multiplication. In this case, the answer to the target question is 1 Ω 1 = 1 x 1 = 1

IMPORTANT: from statement 2, we can conclude that Ω represents EITHER division OR multiplication. Because Ω could represent two different operations, some students will incorrectly conclude that statement 2 is not sufficient.
However, the target question is NOT asking "What operation does Ω represent?" The target question is asking What is the value of 1 Ω 1?

In BOTH of the above cases (for statement 2), 1 Ω 1 = 1.
Since we get only one answer to the target question, statement 2 is SUFFICIENT

Cheers,
Brent
_________________

Test confidently with gmatprepnow.com

Intern
Joined: 29 Oct 2017
Posts: 6
Re: The symbol Ω represents one of the following operations: add  [#permalink]

### Show Tags

31 Oct 2018, 01:08
Bunuel wrote:
rgyanani wrote:
The symbol Ω represents one of the following operations: addition, subtraction, multiplication or division. What is the value of 1 Ω 1?

(1) 2 Ω 2 = 4

(2) 0 Ω 1 = 0

Taken from Magoosh Practice question

Can anyone tell me why it isn't E?

The symbol Ω represents one of the following operations: addition, subtraction, multiplication or division. What is the value of 1 Ω 1?

(1) 2 Ω 2 = 4. This implies that Ω represents addition or multiplication (2+2=4 and 2*2=4). If its addition, then 1 Ω 1 = 1 + 1 = 2 but if its multiplication, then 1 Ω 1 = 1*1 = 1. Not sufficient.

(2) 0 Ω 1 = 0. This implies that Ω represents multiplication or division. In either case 1 Ω 1 = 1. Sufficient.

Hope it's clear.

Hi Bunuel,

Isn't $$\frac{0}{1}$$ supposed to be undefined rather than be equal to zero?
Math Expert
Joined: 02 Sep 2009
Posts: 51261
Re: The symbol Ω represents one of the following operations: add  [#permalink]

### Show Tags

31 Oct 2018, 01:12
kwesibabban wrote:
Bunuel wrote:
rgyanani wrote:
The symbol Ω represents one of the following operations: addition, subtraction, multiplication or division. What is the value of 1 Ω 1?

(1) 2 Ω 2 = 4

(2) 0 Ω 1 = 0

Taken from Magoosh Practice question

Can anyone tell me why it isn't E?

The symbol Ω represents one of the following operations: addition, subtraction, multiplication or division. What is the value of 1 Ω 1?

(1) 2 Ω 2 = 4. This implies that Ω represents addition or multiplication (2+2=4 and 2*2=4). If its addition, then 1 Ω 1 = 1 + 1 = 2 but if its multiplication, then 1 Ω 1 = 1*1 = 1. Not sufficient.

(2) 0 Ω 1 = 0. This implies that Ω represents multiplication or division. In either case 1 Ω 1 = 1. Sufficient.

Hope it's clear.

Hi Bunuel,

Isn't $$\frac{0}{1}$$ supposed to be undefined rather than be equal to zero?

0 divided by anything but 0, is 0: 0/(anything) = 0

anything/0 is undefined. Division by 0 is not allowed.
_________________
Re: The symbol Ω represents one of the following operations: add &nbs [#permalink] 31 Oct 2018, 01:12
Display posts from previous: Sort by