Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 25 Oct 2016, 21:38

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# There is a family with two children. One is a boy, what is

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
Director
Joined: 03 Jul 2003
Posts: 652
Followers: 3

Kudos [?]: 89 [0], given: 0

There is a family with two children. One is a boy, what is [#permalink]

### Show Tags

15 Feb 2004, 00:35
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

There is a family with two children. One is a boy, what is the
probability that the other is a girl?
GMAT Club Legend
Joined: 15 Dec 2003
Posts: 4302
Followers: 37

Kudos [?]: 409 [0], given: 0

[#permalink]

### Show Tags

15 Feb 2004, 00:54
1/2 if the fact that the first kid being a boy is independent of the second kid being a girl
1/4 if the question is about the probability of having first kid a boy and second kid a girl
_________________

Best Regards,

Paul

SVP
Joined: 30 Oct 2003
Posts: 1793
Location: NewJersey USA
Followers: 5

Kudos [?]: 97 [0], given: 0

[#permalink]

### Show Tags

15 Feb 2004, 06:30
I stand by Paul on this one.

Hi Paul,

By any chance r u registered at TestMagic as Paul78 ?

Anand.
Director
Joined: 03 Jul 2003
Posts: 652
Followers: 3

Kudos [?]: 89 [0], given: 0

[#permalink]

### Show Tags

15 Feb 2004, 07:10
Paul wrote:
1/2 if the fact that the first kid being a boy is independent of the second kid being a girl
1/4 if the question is about the probability of having first kid a boy and second kid a girl

Sex of any baby is indepedent of its siblings.
Question stem does not say the first baby is boy.
All it says is one is boy.
SVP
Joined: 30 Oct 2003
Posts: 1793
Location: NewJersey USA
Followers: 5

Kudos [?]: 97 [0], given: 0

[#permalink]

### Show Tags

15 Feb 2004, 07:40
Then what we have is

BG GB GG BB
so dsired events are BG and GB total events are 4
2/4 = 1/2
Director
Joined: 03 Jul 2003
Posts: 652
Followers: 3

Kudos [?]: 89 [0], given: 0

[#permalink]

### Show Tags

15 Feb 2004, 08:07
I don't have official answer.

But, here is my explanation.

Total possibilities = BB, GG, BG, GB
One(Atleast) is BOY = BB, BG, GB
Another is Girl,given than other is BOY = BG , GB

P = 2/3.

As i said before, I don't have official answer!
GMAT Club Legend
Joined: 15 Dec 2003
Posts: 4302
Followers: 37

Kudos [?]: 409 [0], given: 0

[#permalink]

### Show Tags

15 Feb 2004, 10:11
interesting reasoning kpadma. Indeed, you would then have to remove GG to get 2/3. I think it should be right then. Anandnk, yes i'm paul78 on testmagic. Put the same signature so that you could recognize me... you stalker!
_________________

Best Regards,

Paul

GMAT Instructor
Joined: 07 Jul 2003
Posts: 770
Location: New York NY 10024
Schools: Haas, MFE; Anderson, MBA; USC, MSEE
Followers: 22

Kudos [?]: 193 [0], given: 0

[#permalink]

### Show Tags

17 Feb 2004, 07:29
kpadma wrote:
I don't have official answer.

But, here is my explanation.

Total possibilities = BB, GG, BG, GB
One(Atleast) is BOY = BB, BG, GB
Another is Girl,given than other is BOY = BG , GB

P = 2/3.

As i said before, I don't have official answer!

The question should be worded "at least one is a boy" and in that case, 2/3 is the answer. Trust me.

However, as worded, the question states: "ONE is a boy". hence the other child MUST be a girl. If the other was a boy, then the statement "ONE is a boy" would not be true -- because in that case TWO of them are boys!

Of course, this is an oversight and the GMAT would not be so ambiguous.

_________________

Best,

AkamaiBrah
Former Senior Instructor, Manhattan GMAT and VeritasPrep
Vice President, Midtown NYC Investment Bank, Structured Finance IT
MFE, Haas School of Business, UC Berkeley, Class of 2005
MBA, Anderson School of Management, UCLA, Class of 1993

Director
Joined: 03 Jul 2003
Posts: 652
Followers: 3

Kudos [?]: 89 [0], given: 0

[#permalink]

### Show Tags

17 Feb 2004, 08:26
AkamaiBrah wrote:
The question should be worded "at least one is a boy" and in that case, 2/3 is the answer. Trust me.

However, as worded, the question states: "ONE is a boy". hence the other child MUST be a girl. If the other was a boy, then the statement "ONE is a boy" would not be true -- because in that case TWO of them are boys!

Of course, this is an oversight and the GMAT would not be so ambiguous.

Yes, Adding "atleast" makes the question clearer.
Thanks Akamai!
[#permalink] 17 Feb 2004, 08:26
Display posts from previous: Sort by

# There is a family with two children. One is a boy, what is

 post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group and phpBB SEO 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®.