Derrick and Lena a married couple attending the same : GMAT Problem Solving (PS)
Check GMAT Club App Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 09 Dec 2016, 20:36

### 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 June
Open Detailed Calendar

# Derrick and Lena a married couple attending the same

Author Message
TAGS:

### Hide Tags

Intern
Joined: 29 Aug 2012
Posts: 26
Schools: Babson '14
GMAT Date: 02-28-2013
Followers: 0

Kudos [?]: 24 [0], given: 56

Derrick and Lena a married couple attending the same [#permalink]

### Show Tags

28 Nov 2012, 10:11
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 2 sessions

### HideShow timer Statistics

Derrick and Lena a married couple attending the same business school, go to a corporate presentation that ends with two sequential drawings of PDA, among the 60 attending students. If each attendant is given one ticket participating in the lottery of the two PDA's and if each winning ticket is removed from the urn, what is the probability that both PDA will go to the couple?

[Reveal] Spoiler:
Answer to this question is : 1/1770
Math Expert
Joined: 02 Sep 2009
Posts: 35932
Followers: 6860

Kudos [?]: 90102 [0], given: 10413

Re: Derrick and Lena a married couple attending the same [#permalink]

### Show Tags

29 Nov 2012, 02:42
himanshuhpr wrote:
Derrick and Lena a married couple attending the same business school, go to a corporate presentation that ends with two sequential drawings of PDA, among the 60 attending students. If each attendant is given one ticket participating in the lottery of the two PDA's and if each winning ticket is removed from the urn, what is the probability that both PDA will go to the couple?

[Reveal] Spoiler:
Answer to this question is : 1/1770

The first PDA goes to Derek and the second to Lena - 1/60*1/59;
The first PDA goes to Lena and the second to Derek - 1/60*1/59;

Thus, the overall probability that both PDA will go to the couple is 2*1/60*1/59=1/1770.

Hope it's clear.
_________________
Intern
Joined: 29 Aug 2012
Posts: 26
Schools: Babson '14
GMAT Date: 02-28-2013
Followers: 0

Kudos [?]: 24 [0], given: 56

Re: Derrick and Lena a married couple attending the same [#permalink]

### Show Tags

29 Nov 2012, 06:48
Bunuel wrote:

The first PDA goes to Derek and the second to Lena - 1/60*1/59;
The first PDA goes to Lena and the second to Derek - 1/60*1/59;

Thus, the overall probability that both PDA will go to the couple is 2*1/60*1/59=1/1770.

Hope it's clear.

Just for understanding it better, is it right to think in following way:

In 1st case , till the time Derek receives the first PDA every of the 60 participants including Lena have the equal probability of 1/60 of receiving the 1st PDA and after its confirmed that Derek does receive the 1st PDA, the remaining all participants including Lena will have 1/59 probability of receiving the 2nd PDA.

^^^ thinking above on the lines of 'row' concept.
Intern
Joined: 21 Oct 2012
Posts: 26
GMAT Date: 01-19-2013
Followers: 1

Kudos [?]: 7 [0], given: 15

Re: Derrick and Lena a married couple attending the same [#permalink]

### Show Tags

06 Dec 2012, 12:57
The probability of picking up first ticket is 2/60, second is 1/59.
Combined is 2/3540, which is equal to 1/1770
_________________

MGMAT1 - 610
MGMAT2 - 670
MGMAT3 - 640

OMG

Re: Derrick and Lena a married couple attending the same   [#permalink] 06 Dec 2012, 12:57
Similar topics Replies Last post
Similar
Topics:
3 There are 5 married couples and a group of three is to be 2 29 Jan 2011, 13:19
19 A group of 10 people consists of 3 married couples and 4 20 17 May 2011, 07:18
55 If 4 people are selected from a group of 6 married couples 22 13 Aug 2010, 07:42
8 There are 5 married couples and a group of three is to be 8 19 Jul 2008, 16:53
52 Given that there are 6 married couples. If we select only 4 34 18 Jan 2008, 00:05
Display posts from previous: Sort by