BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

Probability Question

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 344
Joined: Sun Sep 28, 2008 11:00 amFollowed by: 1 member
Location: USA
Thanked: 6 times

Re: Probability Question

by Bidisha800 » Sun Feb 15, 2009 2:20 pm
Total possibility = 6C4= 6!/4!2!=15

3 girls and I boy can be selected 1X3 = 3 ways
3 buys and 1 girl can b selected 1 X 3 = 3 ways
2 boys and 3gors can be selected in 9 ways


therefore, probability of selecting equal number of girls and boys = 9/15
=3/5 = 60%
Drill baby drill !

GMATPowerPrep Test1= 740
GMATPowerPrep Test2= 760
Kaplan Diagnostic Test= 700
Kaplan Test1=600
Kalplan Test2=670
Kalplan Test3=570
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 160
Joined: Fri May 30, 2008 7:10 pm
Thanked: 10 times
GMAT Score:600

by dendude » Mon Feb 16, 2009 2:32 pm
peddisetty wrote:Why cant we pick 3 boys 3 girls and 1 boy 1 girl ?
Why is it only two 2 boys and 2 girsl?.

In the question it is asked, equal no of boys and equal no of girls.

Please somebody clarify.

Thanks.
Because, as per the question, 4 children are to be selected.
2 Boys can be chosen in 3C2 = 3 ways
2 Girls can be chosen in 3C2 = 3 ways
And 4 children can be chosen in 6C4 = 15 ways

Using this info, the prob that 2 boys and 2 girls will be chosen is (3*3)/15 = 3/5
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Newbie | Next Rank: 10 Posts
Posts: 5
Joined: Thu Oct 09, 2008 4:37 am

Why?

by ashishsj » Wed Feb 25, 2009 8:34 am
peddisetty wrote:Why cant we pick 3 boys 3 girls and 1 boy 1 girl ?
Why is it only two 2 boys and 2 girsl?.

In the question it is asked, equal no of boys and equal no of girls.

Please somebody clarify.

Thanks.
Because problem states that 4 children have to be selected!
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply