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

 It is currently 19 Feb 2019, 05:22

### 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 February
PrevNext
SuMoTuWeThFrSa
272829303112
3456789
10111213141516
17181920212223
242526272812
Open Detailed Calendar
• ### Free GMAT Prep Hour

February 20, 2019

February 20, 2019

08:00 PM EST

09:00 PM EST

Strategies and techniques for approaching featured GMAT topics. Wednesday, February 20th at 8 PM EST
• ### Online GMAT boot camp for FREE

February 21, 2019

February 21, 2019

10:00 PM PST

11:00 PM PST

Kick off your 2019 GMAT prep with a free 7-day boot camp that includes free online lessons, webinars, and a full GMAT course access. Limited for the first 99 registrants! Feb. 21st until the 27th.

# * represents a certain function for all real numbers. If (1*)*=6

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

### Hide Tags

Intern
Joined: 08 Sep 2018
Posts: 1
* represents a certain function for all real numbers. If (1*)*=6  [#permalink]

### Show Tags

Updated on: 08 Sep 2018, 11:30
3
00:00

Difficulty:

35% (medium)

Question Stats:

62% (01:36) correct 38% (02:14) wrong based on 32 sessions

### HideShow timer Statistics

* represents a certain function for all real numbers. If (1*)* = 6, which of the following could be true for all values of m?

(A) m*= 2m$$^3$$
(B) m* = m(m+1)
(C) m* = (2m)$$^3$$
(D) m* = 3m$$^2$$
(E) m* = m(m-1)(m+1)

Does anyone knows how to solve this question? I have tried to solved and unserstand it but it is not making any sence to me! I know the answer but even like that I just don´t understand it.Thank you for your help!

Originally posted by FilipaFontao on 08 Sep 2018, 01:47.
Last edited by generis on 08 Sep 2018, 11:30, edited 2 times in total.
Edited and formatted the question, renamed the topic
Director
Status: Learning stage
Joined: 01 Oct 2017
Posts: 958
WE: Supply Chain Management (Energy and Utilities)
Re: * represents a certain function for all real numbers. If (1*)*=6  [#permalink]

### Show Tags

08 Sep 2018, 04:07
2
FilipaFontao wrote:
"*" represents a certain function for all real numbers. If (1*)* = 6, which of the following could be true for all values of m?

(A) m*= 2m^3
(B) m* = m(m+1)
(C) m* = (2m)^3
(D) m* = 3m^2
(E) m* = m(m-1)(m+1)

Does anyone knows how to solve this question? I have tried to solved and unserstand it but it is not making any sence to me! I know the answer but even like that I just don´t understand it.

Thank you for your help!

Here the '*' represents a function.
Given, (1*)* = 6 implies that the function under discussion has been applied twice on the real number 1 and the result is 6.

Since it is a COULD BE TRUE type question, we have to analyze each of the options till we arrive at the correct answer.

A. m*= $$2m^3$$
Our only reference in hand is (1*)* = 6.-----------(a)
Let's put m=1, then 1*=2(1^3)=2---------------(b)
Let's apply '*' function again, we have (1*)*=2* (Since 1*=2 from (b))
Now, 2*=$$2(2^3)=8\neq{6}$$ (DISCARD)

B. m* = m(m+1)
Put m=1, we have
1*=1(1+1)=2
Let's apply '*' function again, we have (1*)*=2* (Since 1*=2 from (b))
Now, 2*=2(2+1)=6.
So, (1*)*=2*=6 (MATCHED)

Ans. (B)

P.S:- We have tried m=1 since we have given (1*)*=6.
_________________

Regards,

PKN

Rise above the storm, you will find the sunshine

Re: * represents a certain function for all real numbers. If (1*)*=6   [#permalink] 08 Sep 2018, 04:07
Display posts from previous: Sort by

# * represents a certain function for all real numbers. If (1*)*=6

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

 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®.