NEW HERE? LEARN MORE
closeclose
It is currently 19 Apr 2024, 19:09
Register
GMAT Focus Tests
Decision Tracker
My Rewards
New posts
New comers' posts

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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel

If the symbol § represents one of the following operations:

10 posts Go to First Unread Post
Print view
NEW TOPIC
POST REPLY
Question banks

GMAT Question Banks

Downloads
My Bookmarks
Reviews
SORT BY:
Date
Kudos
avatar
mattycen
Intern
Intern
Joined: 03 Sep 2013
Posts: 1
If the symbol § represents one of the following operations: [#permalink] New post  06 Oct 2013, 11:12
2
Kudos
26
Bookmarks
00:00
A
B
C
D
E

Difficulty:

65% (hard)

Question Stats:

49% (01:35) correct 51% (01:43) wrong based on 609 sessions
Hide Show timer Statistics
If the symbol § represents one of the following operations: addition, subtraction or multiplication, and x≠0, then what is the value of (x§2)§x?

(1) x=5
(2) (−1)§(−2)≠(−2)§(−1)

Hello guys, I can't understand how the answer to this question could be the one indicated.
It would be great if someone would explain me how does it work.
ShowHide Answer
Official Answer
Official Answer and Stats are available only to registered users. Register/Login.
request expert reply
Most Helpful Reply
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 92760
CAT Tests Forum Quiz Mode
Re: If the symbol § represents one of the following operations: [#permalink] New post  06 Oct 2013, 11:19
4
Kudos
2
Bookmarks
Expert Reply
If the symbol § represents one of the following operations: addition, subtraction or multiplication, and x≠0, then what is the value of (x§2)§x?

(1) x=5. We need to know what § represents.

(2) (−1)§(−2)≠(−2)§(−1). § is neither addition nor multiplication. Thus it's subtraction: (x§2)§x = (x-2)-x=-2. Sufficient.

Answer: B.
_________________
New to the GMAT CLUB Forum?

My Signature Questions' Collection:


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics
Signature Read More
General Discussion
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 92760
CAT Tests Forum Quiz Mode
Re: If the symbol § represents one of the following operations: [#permalink] New post  06 Oct 2013, 11:20
2
Kudos
2
Bookmarks
Expert Reply
Bunuel wrote:
If the symbol § represents one of the following operations: addition, subtraction or multiplication, and x≠0, then what is the value of (x§2)§x?

(1) x=5. We need to know what § represents.

(2) (−1)§(−2)≠(−2)§(−1). § is neither addition nor multiplication. Thus it's subtraction: (x§2)§x = (x-2)-x=-2. Sufficient.

Answer: B.


Similar questions to practice:
if-represents-one-of-the-operations-and-x-is-k-l-m-144138.html
if-denotes-one-of-two-arithmetic-operations-addition-or-50178.html
if-the-symbol-represents-either-addition-or-multiplication-104600.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
if-denotes-one-of-the-four-arithmetic-operations-addition-105472.html
the-symbol-represents-one-of-the-four-arithmetic-operation-107575.html
if-the-symbol-represents-either-addition-subtraction-101741.html
if-the-symbol-represents-either-addition-or-multiplication-104600.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

Hope it helps.
_________________
New to the GMAT CLUB Forum?

My Signature Questions' Collection:


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics
Signature Read More
User avatar
Naina1
Intern
Intern
Joined: 05 Feb 2015
Posts: 39
Concentration: Finance, Entrepreneurship
Schools: ISB '16 IIMC IIMA IIMB
WE:Information Technology (Health Care)
Re: If the symbol § represents one of the following operations: [#permalink] New post  07 May 2015, 10:10
Hi mattycen

1) is definitely insufficient because depending upon what the symbol denotes, the value would change.

2) -a * -b -> this would always be equal to -b * -a
-a + -b -> this equals -a -b or -b + -a
the only operation here is subtraction that could change the value of the given expression.
So, using this we can calculate the value of (x§2)§x
User avatar
D
BrushMyQuant
Tutor
Joined: 05 Apr 2011
Status:Tutor - BrushMyQuant
Posts: 1777
Location: India
Concentration: Finance, Marketing
Schools: XLRI (A)
GMAT 1: 700 Q51 V31
GPA: 3
WE:Information Technology (Computer Software)
Re: If the symbol § represents one of the following operations: [#permalink] New post  18 Jul 2015, 13:59
Expert Reply
mattycen wrote:
If the symbol § represents one of the following operations: addition, subtraction or multiplication, and x≠0, then what is the value of (x§2)§x?

(1) x=5
(2) (−1)§(−2)≠(−2)§(−1)

Hello guys, I can't understand how the answer to this question could be the one indicated.
It would be great if someone would explain me how does it work.

Please move this to DS from PS. Thank you
_________________
How to Solve :
All Quant Topics Theory || Units' Digit Problems || Absolute Value Basics || Inequalities || Absolute Value + Inequality || Functions and Custom Characters || LCM & GCD || Remainders || Factors and Multiples || Arithmetic and Geometric Progression || Co-ordinate Geometry || Circles || Probability: Coin Toss || Work Rate || Statistics || Stem & Leaf Plot || Box And Whisker Plot

GMAT Club Topic Wise Problems
Signature Read More
User avatar
G
ENGRTOMBA2018
SVP
SVP
Joined: 20 Mar 2014
Posts: 2362
Concentration: Finance, Strategy
Schools: Kellogg '18 (M)
GMAT 1: 750 Q49 V44
GPA: 3.7
WE:Engineering (Aerospace and Defense)
GMAT ToolKit User Reviews Badge
Re: If the symbol § represents one of the following operations: [#permalink] New post  18 Jul 2015, 15:51
nktdotgupta wrote:
mattycen wrote:
If the symbol § represents one of the following operations: addition, subtraction or multiplication, and x≠0, then what is the value of (x§2)§x?

(1) x=5
(2) (−1)§(−2)≠(−2)§(−1)

Hello guys, I can't understand how the answer to this question could be the one indicated.
It would be great if someone would explain me how does it work.

Please move this to DS from PS. Thank you


Done. Thankyou for the information.
_________________
My Kellogg Journey (2016-2018): https://gmatclub.com/forum/my-kellogg-journey-325661.html
Thursday with Ron updated list as of July 1st, 2015: https://gmatclub.com/forum/consolidated-thursday-with-ron-list-for-all-the-sections-201006.html#p1544515
Rules for Posting in Quant Forums: https://gmatclub.com/forum/rules-for-posting-please-read-this-before-posting-133935.html
Writing Mathematical Formulae in your posts: https://gmatclub.com/forum/rules-for-posting-please-read-this-before-posting-133935.html#p1096628
GMATCLUB Math Book: https://gmatclub.com/forum/gmat-math-book-in-downloadable-pdf-format-130609.html
Everything Related to Inequalities: https://gmatclub.com/forum/inequalities-made-easy-206653.html#p1582891
Inequalities tips: https://gmatclub.com/forum/inequalities-tips-and-hints-175001.html
Debrief, 650 to 750: https://gmatclub.com/forum/650-to-750-a-10-month-journey-to-the-score-203190.html
Signature Read More
avatar
B
azamaka
Intern
Intern
Joined: 10 Jun 2014
Posts: 17
GMAT ToolKit User
Re: If the symbol § represents one of the following operations: [#permalink] New post  21 Sep 2016, 02:51
Bunuel wrote:
If the symbol § represents one of the following operations: addition, subtraction or multiplication, and x≠0, then what is the value of (x§2)§x?

(1) x=5. We need to know what § represents.

(2) (−1)§(−2)≠(−2)§(−1). § is neither addition nor multiplication. Thus it's subtraction: (x§2)§x = (x-2)-x=-2. Sufficient.

Answer: B.





x can be negative in that case answer B is not right one. Do u agree with that?
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 92760
CAT Tests Forum Quiz Mode
Re: If the symbol § represents one of the following operations: [#permalink] New post  21 Sep 2016, 03:09
Expert Reply
azamaka wrote:
Bunuel wrote:
If the symbol § represents one of the following operations: addition, subtraction or multiplication, and x≠0, then what is the value of (x§2)§x?

(1) x=5. We need to know what § represents.

(2) (−1)§(−2)≠(−2)§(−1). § is neither addition nor multiplication. Thus it's subtraction: (x§2)§x = (x-2)-x=-2. Sufficient.

Answer: B.





x can be negative in that case answer B is not right one. Do u agree with that?


No, that's not right.

From (2) we know that § represents subtraction. We need to find the value of (x§2)§x, thus since § represents subtraction, the value of (x-2)-x. x there cancels out and we get that (x-2)-x=-2. Therefore we get that (x§2)§x = (x-2)-x=-2 irrespective of the value of x, positive or negative.

Hope it's clear.
_________________
New to the GMAT CLUB Forum?

My Signature Questions' Collection:


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics
Signature Read More
avatar
B
NilayHalder
Intern
Intern
Joined: 01 May 2019
Posts: 1
Re: If the symbol § represents one of the following operations: [#permalink] New post  04 May 2020, 08:10
Bunuel wrote:
If the symbol § represents one of the following operations: addition, subtraction or multiplication, and x≠0, then what is the value of (x§2)§x?

(1) x=5. We need to know what § represents.

(2) (−1)§(−2)≠(−2)§(−1). § is neither addition nor multiplication. Thus it's subtraction: (x§2)§x = (x-2)-x=-2. Sufficient.

Answer: B.


what if (x§2)=2-x not x-2
User avatar
bumpbot
Non-Human User
Joined: 09 Sep 2013
Posts: 32545
Re: If the symbol § represents one of the following operations: [#permalink] New post  25 Feb 2023, 23:03
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources
Signature Read More
GMAT Club Bot
gmatclubot
Re: If the symbol § represents one of the following operations: [#permalink]
25 Feb 2023, 23:03
NEW TOPIC
POST REPLY
Downloads
My Bookmarks
Reviews
Moderator:
Bunuel
Math Expert
92760 posts

cron

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions