NEW HERE? LEARN MORE
closeclose
It is currently 27 Sep 2023, 17:45
Register
GMAT Club 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

Does the product jkmn equal 1?

9 posts Go to First Unread Post
Print view
NEW TOPIC
POST REPLY
Downloads
My Bookmarks
Reviews
SORT BY:
Date
Kudos
avatar
paki
Intern
Intern
Joined: 01 Dec 2005
Posts: 13
Location: Sugar Land, Texas
Does the product jkmn equal 1? [#permalink] New post  Updated on: 07 Oct 2022, 08:18
8
Bookmarks
Quiz Dashboard Attempt only this question Same topic and source Same topic and difficulty Same source and difficulty Random Chronological Reverse chronological Learn more
00:00
A
B
C
D
E

Difficulty:

5% (low)

Question Stats:

85% (00:57) correct 15% (01:03) wrong based on 748 sessions

Hide Show timer Statistics

Does the product jkmn equal 1?

(1) \(\frac{jk}{mn} = 1\)

(2) \(j = \frac{1}{k}\) and \(m = \frac{1}{n}\)
ShowHide Answer
Official Answer
Official Answer and Stats are available only to registered users. Register/Login.

Originally posted by paki on 16 Dec 2005, 14:49.
Last edited by Bunuel on 07 Oct 2022, 08:18, edited 2 times in total.
Quiz Dashboard Attempt only this question Same topic and source Same topic and difficulty Same source and difficulty Random Chronological Reverse chronological Learn more
User avatar
yb
Senior Manager
Senior Manager
Joined: 05 Oct 2005
Posts: 391
Re: Does the product jkmn equal 1? [#permalink] New post  16 Dec 2005, 16:05
1
Bookmarks
paki wrote:
Does the product JKMN = 1?

(1) (JK)/(MN) = 1

(2) J= (1/K) and M = (1/N)


B.

1) JK/MN = 1 ..... JK = MN , all we know is that JK and MN are equal, but could be any value, not just 1..... INSUFF

2) Substitute: (1/K)*K*(1/N)*N = 1.... SUFF
avatar
NvrEvrGvUp
Intern
Intern
Joined: 11 Jan 2011
Posts: 45
GMAT 1: 680 Q44 V39
GMAT 2: 710 Q48 V40
GMAT ToolKit User
Re: Does the product jkmn equal 1? [#permalink] New post  31 Oct 2013, 18:03
1
Bookmarks
Bumping this up for a quick question.

Original question is asking whether jkmn = 1.

I rephrased to: does jk = 1/(mn) by dividing both sides by mn

Statement 1: jk/mn = 1 --> rephrase to jk = mn
Since jk = mn and does not equal 1/mn, I said this was sufficient.

Statement 2: j = 1/k; m = 1/n --> rephrase to jk = 1 and mn = 1
Sufficient

I chose answer choice D while the OA is B. Can someone please explain where I went wrong?
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 89492
CAT Tests Forum Quiz Mode
Re: Does the product jkmn equal 1? [#permalink] New post  01 Nov 2013, 01:10
Expert Reply
NvrEvrGvUp wrote:
Bumping this up for a quick question.

Original question is asking whether jkmn = 1.

I rephrased to: does jk = 1/(mn) by dividing both sides by mn

Statement 1: jk/mn = 1 --> rephrase to jk = mn
Since jk = mn and does not equal 1/mn, I said this was sufficient.

Statement 2: j = 1/k; m = 1/n --> rephrase to jk = 1 and mn = 1
Sufficient

I chose answer choice D while the OA is B. Can someone please explain where I went wrong?


jk = mn and jk = 1/mn does not exclude each other.

Does the product JKMN = 1?

(1) (JK)/(MN) = 1 --> JK=MN. The question becomes: does (MN)^2=1. We don't know that. Not sufficient.

(2) J= (1/K) and M = (1/N) --> JKMN = 1/K*K*1/N*N = 1. 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
avatar
B
HermesM11
Current Student
Joined: 09 Oct 2021
Posts: 15
Location: El Salvador
Schools: Simon '24 (WA) Carlson (WL) Broad (A) BU (WL)
GMAT 1: 620 Q48 V27
GPA: 3.6
WE:Project Management (Other)
Re: Does the product jkmn equal 1? [#permalink] New post  01 Nov 2021, 22:23
Bunuel wrote:
NvrEvrGvUp wrote:
Bumping this up for a quick question.

Original question is asking whether jkmn = 1.

I rephrased to: does jk = 1/(mn) by dividing both sides by mn

Statement 1: jk/mn = 1 --> rephrase to jk = mn
Since jk = mn and does not equal 1/mn, I said this was sufficient.

Statement 2: j = 1/k; m = 1/n --> rephrase to jk = 1 and mn = 1
Sufficient

I chose answer choice D while the OA is B. Can someone please explain where I went wrong?


jk = mn and jk = 1/mn does not exclude each other.

Does the product JKMN = 1?

(1) (JK)/(MN) = 1 --> JK=MN. The question becomes: does (MN)^2=1. We don't know that. Not sufficient.

(2) J= (1/K) and M = (1/N) --> JKMN = 1/K*K*1/N*N = 1. Sufficient.

Answer: B.


But what happens if K=0 or N=0? It would be wrong to assume 1/K*K=1 because of the indetermination. Can someone clarify?
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 89492
CAT Tests Forum Quiz Mode
Re: Does the product jkmn equal 1? [#permalink] New post  02 Nov 2021, 01:26
Expert Reply
HermesM11 wrote:
Bunuel wrote:
NvrEvrGvUp wrote:
Bumping this up for a quick question.

Original question is asking whether jkmn = 1.

I rephrased to: does jk = 1/(mn) by dividing both sides by mn

Statement 1: jk/mn = 1 --> rephrase to jk = mn
Since jk = mn and does not equal 1/mn, I said this was sufficient.

Statement 2: j = 1/k; m = 1/n --> rephrase to jk = 1 and mn = 1
Sufficient

I chose answer choice D while the OA is B. Can someone please explain where I went wrong?


jk = mn and jk = 1/mn does not exclude each other.

Does the product JKMN = 1?

(1) (JK)/(MN) = 1 --> JK=MN. The question becomes: does (MN)^2=1. We don't know that. Not sufficient.

(2) J= (1/K) and M = (1/N) --> JKMN = 1/K*K*1/N*N = 1. Sufficient.

Answer: B.


But what happens if K=0 or N=0? It would be wrong to assume 1/K*K=1 because of the indetermination. Can someone clarify?


Division by 0 is not allowed: anything/0 is undefined. So, for (2) neither k nor n can be 0 because in this case 1/k and 1/n would be undefined and could not equal to real numbers j and m.

Does this make sense?
_________________
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
HermesM11
Current Student
Joined: 09 Oct 2021
Posts: 15
Location: El Salvador
Schools: Simon '24 (WA) Carlson (WL) Broad (A) BU (WL)
GMAT 1: 620 Q48 V27
GPA: 3.6
WE:Project Management (Other)
Re: Does the product jkmn equal 1? [#permalink] New post  02 Nov 2021, 13:23
Bunuel wrote:
HermesM11 wrote:

But what happens if K=0 or N=0? It would be wrong to assume 1/K*K=1 because of the indetermination. Can someone clarify?


Division by 0 is not allowed: anything/0 is undefined. So, for (2) neither k nor n can be 0 because in this case 1/k and 1/n would be undefined and could not equal to real numbers j and m.

Does this make sense?


Got it! But it seems that I need to assume every number on GMAT is real, right? The question doesn’t mention it.

Posted from my mobile device
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 89492
CAT Tests Forum Quiz Mode
Re: Does the product jkmn equal 1? [#permalink] New post  02 Nov 2021, 13:32
Expert Reply
HermesM11 wrote:
Bunuel wrote:
HermesM11 wrote:

But what happens if K=0 or N=0? It would be wrong to assume 1/K*K=1 because of the indetermination. Can someone clarify?


Division by 0 is not allowed: anything/0 is undefined. So, for (2) neither k nor n can be 0 because in this case 1/k and 1/n would be undefined and could not equal to real numbers j and m.

Does this make sense?


Got it! But it seems that I need to assume every number on GMAT is real, right? The question doesn’t mention it.

Posted from my mobile device


Yes, all numbers used are real numbers by default.
_________________
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
bumpbot
Non-Human User
Joined: 09 Sep 2013
Posts: 29502
Re: Does the product jkmn equal 1? [#permalink] New post  03 May 2023, 03:04
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: Does the product jkmn equal 1? [#permalink]
03 May 2023, 03:04
NEW TOPIC
POST REPLY
Downloads
My Bookmarks
Reviews
Moderator:
Bunuel
Math Expert
89492 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