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

 It is currently 19 Oct 2019, 16:14

### 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

# If 1@1 =1, is −2@−2=1

Author Message
TAGS:

### Hide Tags

Senior Manager
Joined: 19 Nov 2017
Posts: 253
Location: India
Schools: ISB
GMAT 1: 670 Q49 V32
GPA: 4
If 1@1 =1, is −2@−2=1  [#permalink]

### Show Tags

25 Jul 2018, 08:43
3
00:00

Difficulty:

55% (hard)

Question Stats:

50% (01:10) correct 50% (01:09) wrong based on 55 sessions

### HideShow timer Statistics

If $$1$$@$$1$$ $$= 1$$, is $$-2$$@$$-2$$ $$= 1$$?

A. $$-1$$@$$-1$$ = $$1$$
B. $$0$$@$$0$$ = $$0$$

_________________

Vaibhav

Sky is the limit. 800 is the limit.

~GMAC
MBA Section Director
Affiliations: GMATClub
Joined: 22 May 2017
Posts: 2598
GPA: 4
WE: Engineering (Computer Software)
If 1@1 =1, is −2@−2=1  [#permalink]

### Show Tags

25 Jul 2018, 09:14
1 "@" 1 = 1

=> "@" can be multiplication, division, exponent etc

We need to find a unique value for -2 @ -2

Statement 1

-1 @ -1 = 1

can be multiplication or division

=> -2 @ -2 can be either 4 or 1

Statement 1 is not sufficient

Statement 2

0 @ 0 = 0

=> "@" can be multiplication

=> -2 @ -2 can be -2 * -2

=> -2 @ -2 can be 4

=> -2 @ -2 $$\neq$$ 1

Statement 2 is sufficient

Hence option B
_________________
Intern
Joined: 12 Nov 2017
Posts: 2
If 1@1 =1, is −2@−2=1  [#permalink]

### Show Tags

Updated on: 24 Aug 2018, 06:24
for statement 2 : is 0/0 is not possible?

Originally posted by Nikz021 on 23 Aug 2018, 01:06.
Last edited by Nikz021 on 24 Aug 2018, 06:24, edited 1 time in total.
VP
Status: Learning stage
Joined: 01 Oct 2017
Posts: 1013
WE: Supply Chain Management (Energy and Utilities)
Re: If 1@1 =1, is −2@−2=1  [#permalink]

### Show Tags

23 Aug 2018, 02:03
2
Nikz021 wrote:
for statement 2 : is 0/0 is not poosible?

Hi Nikz021,

Here the operation "@" yields a definite value.

You know $$\frac{0}{0}$$ is undefined.

Hence we can't take consider 0/0 which is undefined.

Hope it helps.
_________________
Regards,

PKN

Rise above the storm, you will find the sunshine
Re: If 1@1 =1, is −2@−2=1   [#permalink] 23 Aug 2018, 02:03
Display posts from previous: Sort by