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

It is currently 17 Jan 2019, 22:25

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 in January
PrevNext
SuMoTuWeThFrSa
303112345
6789101112
13141516171819
20212223242526
272829303112
Open Detailed Calendar
  • The winning strategy for a high GRE score

     January 17, 2019

     January 17, 2019

     08:00 AM PST

     09:00 AM PST

    Learn the winning strategy for a high GRE score — what do people who reach a high score do differently? We're going to share insights, tips and strategies from data we've collected from over 50,000 students who used examPAL.
  • Free GMAT Strategy Webinar

     January 19, 2019

     January 19, 2019

     07:00 AM PST

     09:00 AM PST

    Aiming to score 760+? Attend this FREE session to learn how to Define your GMAT Strategy, Create your Study Plan and Master the Core Skills to excel on the GMAT.

One number, k, is selected at random from a set of 11 consec

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Director
Director
User avatar
Joined: 01 Apr 2008
Posts: 768
Name: Ronak Amin
Schools: IIM Lucknow (IPMX) - Class of 2014
One number, k, is selected at random from a set of 11 consec  [#permalink]

Show Tags

New post 25 Oct 2009, 04:16
3
00:00
A
B
C
D
E

Difficulty:

  75% (hard)

Question Stats:

41% (01:10) correct 59% (01:12) wrong based on 138 sessions

HideShow timer Statistics

One number, k, is selected at random from a set of 11 consecutive even integers. What is the probability that k = 10?

(1) The average (arithmetic mean) of the set is zero.

(2) The probability that k = 10 is the same as the probability that k = -10.
Senior Manager
Senior Manager
avatar
Joined: 18 Aug 2009
Posts: 275
Re: prob3  [#permalink]

Show Tags

New post 25 Oct 2009, 06:34
Answer is A.

Statement 1: The set must be = {-10, -8, -6, -4, -2, 0, 2, 4, 6, 8, 10}
Statement 2: We do not know if probability is 0 or 1/11. Insufficient.
Retired Moderator
User avatar
Joined: 02 Sep 2010
Posts: 765
Location: London
GMAT ToolKit User Reviews Badge
Re: prob3  [#permalink]

Show Tags

New post 09 Oct 2010, 16:08
1
Economist wrote:
One number, k , is selected at random from a set of 11 consecutive even integers. What is the probability that
k = 10?


(1) The average (arithmetic mean) of the set is zero.

(2) The probability that k = 10 is the same as the probability that k = -10.


(1) The set has to be {-10,-8,...,8,10}. So prob(k=10)=1/11. Sufficient

(2) Both 10 and -10 cannot be in any set of ten consecutive even integers except the above set. So either probability is 1/11 OR we have a set with neither inside, in which case probability is 0. Insufficient

Answer is (a)
_________________

Math write-ups
1) Algebra-101 2) Sequences 3) Set combinatorics 4) 3-D geometry

My GMAT story

GMAT Club Premium Membership - big benefits and savings

Manager
Manager
avatar
Status: GMAT Preperation
Joined: 04 Feb 2010
Posts: 91
Concentration: Social Entrepreneurship, Social Entrepreneurship
GPA: 3
WE: Consulting (Insurance)
Re: prob3  [#permalink]

Show Tags

New post 16 Oct 2010, 04:34
1) The average (arithmetic mean) of the set is zero. or the question stem does not state that 10 is a part of the set.. so E..

comments ?
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 9421
Premium Member
Re: One number, k, is selected at random from a set of 11 consec  [#permalink]

Show Tags

New post 24 Jan 2018, 05:55
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

GMAT Club Bot
Re: One number, k, is selected at random from a set of 11 consec &nbs [#permalink] 24 Jan 2018, 05:55
Display posts from previous: Sort by

One number, k, is selected at random from a set of 11 consec

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


Copyright

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®.