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

Redeem

Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

★★★★★5.0559 reviews
GMATLiveTeach Starts Oct 17
Chris Peckover, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Chris Peckover, 100th-Percentile GMAT Scorer

Oct 17 · Chris Peckover
Sat · 11:00 AM to 2:00 PM ET
Oct 20 · Chris Peckover
Tue, Thu · 8:00 to 10:00 PM ET
Oct 25 · Josh Braslow
Sun · 1:00 to 4:00 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemand 5 seats left Start anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

Probablity - Die

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 70
Joined: Wed Feb 03, 2010 5:21 pm
GMAT Score:720
by skalevar » Tue Sep 07, 2010 6:47 pm
What is the probability of getting exactly 2 sixes on three rolls of a fair six sided die?

Can someone please provide an answer and explanation to the questions above? From Veritas Prep: Probability & Combinatorics.

(Answer is 5/72)



I got as far as # Total Outcomes = 6*6*6 =216, but I can't see how to find the # of favourable outcomes. Any insights you can give are much appreciated.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
User avatar
GMAT Instructor
Posts: 3650
Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members
Location: India
Thanked: 267 times
GMAT Score:760

by sanju09 » Tue Sep 07, 2010 7:53 pm
skalevar wrote:What is the probability of getting exactly 2 sixes on three rolls of a fair six sided die?

Can someone please provide an answer and explanation to the questions above? From Veritas Prep: Probability & Combinatorics.

(Answer is 5/72)



I got as far as # Total Outcomes = 6*6*6 =216, but I can't see how to find the # of favourable outcomes. Any insights you can give are much appreciated.
Given that two of the rolls show up a SIX, the remaining single roll can show up 5 possibilities other than a SIX, and those 5 possibilities could be assigned to any of the 3 rolls of die; a total of 5 × 3 ways favor the required event out of a total of 6 × 6 × 6 number of ways.

Required probability = (5 × 3)/ (6 × 6 × 6) = [spoiler]5/72[/spoiler]
The mind is everything. What you think you become. -Lord Buddha



Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 1179
Joined: Sun Apr 11, 2010 9:07 pmFollowed by: 88 members
Location: Milpitas, CA
Thanked: 447 times

by Rahul@gurome » Tue Sep 07, 2010 7:54 pm
Solution:
Probability of having a six on a single roll of a die is 1/6.
Probability that there is no six on a single roll of die is 5/6.
0r probability of only 2 sixes in three rolls of die is (1/6)*(1/6)*(5/6) = 5/216. Here we multiply by 5/6 because one of the three rolls have to be without 6.
Number of ways of having only 2 sixes in three rolls of a die is 3C2 = 3.

So required probability is 3*(5/216) = 5/72.
Rahul Lakhani
Quant Expert
Gurome, Inc.
https://www.GuroMe.com
On MBA sabbatical (at ISB) for 2011-12 - will stay active as time permits
1-800-566-4043 (USA)
+91-99201 32411 (India)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1