Commitee

Expert replies

shilpaqueen: Junior | Next Rank: 30 Posts; Posts: 19; Joined: Thu Jul 29, 2010 2:12 am

by shilpaqueen » Sun Nov 21, 2010 10:54 am

A committee of 5 is to be chosen from a group of 9 children. What is the probality that there is atleast 1 girl in the commitee?
1) there are 8 boys and 1 girl in the group
2) there are 4 boys in the commitee

Like this post

Source: Beat The GMAT — Data Sufficiency | Sun Nov 21, 2010 10:54 am

clock60: Legendary Member; Posts: 759; Joined: Mon Apr 26, 2010 10:15 amFollowed by: 3 members; Thanked: 85 times

by clock60 » Sun Nov 21, 2010 12:45 pm

debatable question
to me 1 st is suffcient, we can calculate the prob of 1 girl and 4 boys
from 2 we know that 4 boys are already in committee, but we are not given that we have at least 1 girl to chose from to me it is possible that we have no girls at all, as we are given clearly only 9 children
my pick for A

Like this post

shilpaqueen: Junior | Next Rank: 30 Posts; Posts: 19; Joined: Thu Jul 29, 2010 2:12 am

by shilpaqueen » Mon Nov 22, 2010 10:02 am

clock60 wrote:debatable question
to me 1 st is suffcient, we can calculate the prob of 1 girl and 4 boys
from 2 we know that 4 boys are already in committee, but we are not given that we have at least 1 girl to chose from to me it is possible that we have no girls at all, as we are given clearly only 9 children
my pick for A

The official answer is D

Like this post

goyalsau: Legendary Member; Posts: 866; Joined: Mon Aug 02, 2010 6:46 pm; Location: Gwalior, India; Thanked: 31 times

by goyalsau » Tue Nov 23, 2010 3:36 am

shilpaqueen wrote:A committee of 5 is to be chosen from a group of 9 children. What is the probality that there is atleast 1 girl in the commitee?
1) there are 8 boys and 1 girl in the group
2) there are 4 boys in the commitee

I am Convinced that the answer should be D, But What if have this question on the Problem Solving Section,

Guys Please Explain How to solve it,

Saurabh Goyal
[email protected]
-------------------------

EveryBody Wants to Win But Nobody wants to prepare for Win.

Like this post

TOPGMAT: Senior | Next Rank: 100 Posts; Posts: 86; Joined: Wed Aug 25, 2010 11:00 am; Thanked: 1 times

by TOPGMAT » Wed Nov 24, 2010 11:08 pm

Hi math guru's
How can statement 2 be sufficient here ?

4 boys in the commitee...
there can be 8B and 1G in the group, or 7B and 2G in the group etc...
probablity changes as no of girls changes.

Never mind what others do; do better than yourself, beat your own record from day to day and you are a success - William Boetcker

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

560 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review