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

It is currently 17 Oct 2019, 23:58

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

n is an integer chosen at random from the set {5, 7, 9, 11 } p is

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

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 58427
n is an integer chosen at random from the set {5, 7, 9, 11 } p is  [#permalink]

Show Tags

New post 18 May 2016, 01:47
1
4
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

76% (01:32) correct 24% (01:48) wrong based on 78 sessions

HideShow timer Statistics

Current Student
avatar
B
Joined: 07 Mar 2015
Posts: 108
Location: India
Concentration: General Management, Operations
GMAT 1: 590 Q46 V25
GPA: 3.84
WE: Engineering (Energy and Utilities)
Re: n is an integer chosen at random from the set {5, 7, 9, 11 } p is  [#permalink]

Show Tags

New post 18 May 2016, 04:32
1
It can be (5,18) or (9,14)
Prob of 5,18 is ( 4*5/2) =10

Similarly for 9,14 is 10
So 10+10 / 100 = 0.2.
Intern
Intern
avatar
Joined: 06 Feb 2016
Posts: 8
Re: n is an integer chosen at random from the set {5, 7, 9, 11 } p is  [#permalink]

Show Tags

New post 18 May 2016, 18:03
2
Hi everybody.
Set N: there is 4 ways to chose a number
Set P: there is 5 ways to chose a number
so total outcome is 4*5 = 20 which is represent 20 pairs of number
now we have 2 pairs can give us 23 which are (5,8) and (9,14) .
2/20 = 0.1


I dont know if it the right solution or no t.... will see
Manager
Manager
User avatar
B
Joined: 17 Nov 2014
Posts: 50
Location: India
Re: n is an integer chosen at random from the set {5, 7, 9, 11 } p is  [#permalink]

Show Tags

New post 19 May 2016, 07:23
n {5, 7, 9, 11 }

p {2, 6, 10, 14, 18}

n + p = 23

Statement 1 : Let us start with n=5 What would be P for the sum of n+p to be 23, it has to be 18
n = 7 P should be 17 but its not the part of set P, so such a combination is not possible.
n = 9 P should be 14

(5,18) or (9,14). The probability of picking 5 from set n and 18 from set P is = 1/4 * 1/5.
The probability of picking 9 from set n and 14 from set P is = 1/4 * 1/5.

Hence Solution is : 2*(1/20)= 0.1
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 13241
Re: n is an integer chosen at random from the set {5, 7, 9, 11 } p is  [#permalink]

Show Tags

New post 03 Aug 2019, 06:22
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 Club Bot
Re: n is an integer chosen at random from the set {5, 7, 9, 11 } p is   [#permalink] 03 Aug 2019, 06:22
Display posts from previous: Sort by

n is an integer chosen at random from the set {5, 7, 9, 11 } p is

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





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne