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

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
User avatar
Master | Next Rank: 500 Posts
Posts: 158
Joined: Wed Jun 16, 2010 8:21 amFollowed by: 1 member
Thanked: 13 times

by rohit_gmat » Sat Sep 11, 2010 7:21 pm
ranjani2002 wrote:A box has 6 red hats and 5 green hats. what is the probability of drawing atleast one green hat in 2 consecutive drawings if the hat is not replaced?

a. 10/11
b. 8/11
c. 7/12
d. 5/13
e. 2/7
This can be solved by "brute force"

Possibilities are : GG, RG & GR
GG = 5/11 x 4/10 = 20/110
RG = 6/11 x 5/10 = 30/110
GR = 5/11 x 6/10 = 30/110

P(at least one green) = P (GG or RG or GR) = 20/110 + 30/110 + 30/110 = 80/110 = 8/11

Answer is B
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 537
Joined: Fri Jan 22, 2010 10:06 pmFollowed by: 1 member
Thanked: 14 times

by frank1 » Sat Sep 11, 2010 8:50 pm
i have not seen much easier question in probablities...
any way i think easier way to do this would be
both 1-Both r
ie 1-(6/11 x 5/10)=8/11
GMAT score is equally counted as your GPA and 78 clicks can change you life.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1