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

It is currently 20 Jun 2018, 14:17

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.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If two integers x and y such x>y are selected at random between -8 and

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

Hide Tags

Expert Post
Math Revolution GMAT Instructor
User avatar
D
Joined: 16 Aug 2015
Posts: 5585
GMAT 1: 800 Q59 V59
GPA: 3.82
If two integers x and y such x>y are selected at random between -8 and [#permalink]

Show Tags

New post 16 May 2017, 01:33
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

75% (01:19) correct 25% (01:38) wrong based on 59 sessions

HideShow timer Statistics

If two integers x and y such x>y are selected at random between -8 and 11, inclusive, how many cases are possible?

A. 150
B. 180
C. 190
D. 210
E. 240

_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only $99 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"

Senior Manager
Senior Manager
avatar
G
Joined: 24 Apr 2016
Posts: 333
Re: If two integers x and y such x>y are selected at random between -8 and [#permalink]

Show Tags

New post 16 May 2017, 14:48
If X is -8, then the possible values for y are (-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8,9,10,11)

So there are 19 combinations possible, when x is -8

Similarly, if x is -7, then y can take 18 values.

So the total number of combinations = 19+18+17+16+15+..+3+2+1 = 19/2 * (19+1) = 19 * 10 = 190

Answer is c
Expert Post
Math Revolution GMAT Instructor
User avatar
D
Joined: 16 Aug 2015
Posts: 5585
GMAT 1: 800 Q59 V59
GPA: 3.82
Re: If two integers x and y such x>y are selected at random between -8 and [#permalink]

Show Tags

New post 18 May 2017, 01:08
==> Since two integers from -8 to 11 are being randomly selected and x>y, you use combination. Thus, the number of integers from -8 to 11 becomes 11-(-8)+1=20, so 20, then 20C2=(20)(19)/2!=190.

The answer is C.
Answer: C
_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only $99 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"

Senior Manager
Senior Manager
User avatar
S
Joined: 24 Oct 2016
Posts: 294
Location: India
Concentration: Finance, International Business
Schools: IIMB
GMAT 1: 550 Q42 V28
GPA: 3.96
WE: Human Resources (Retail Banking)
Re: If two integers x and y such x>y are selected at random between -8 and [#permalink]

Show Tags

New post 22 May 2017, 03:24
the answer is C

see we need to select two integers between -8 to 11( inclusive) that are total 20 integers there where x>y , so we can choose like this 20ways(y) * 19 ways(X) =380ways but the order does not matter here means whether we choose x first or y first the order is same so divide with 2 such as 380/2= 190 ways to select .

if you liked it press kudos
Re: If two integers x and y such x>y are selected at random between -8 and   [#permalink] 22 May 2017, 03:24
Display posts from previous: Sort by

If two integers x and y such x>y are selected at random between -8 and

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


GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

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®.