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 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

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
Limited cohort · enrollment openTarget 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.

PS Question # 2 - Siblings

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Senior | Next Rank: 100 Posts
Posts: 82
Joined: Sat Aug 21, 2010 8:18 am
Location: India
Thanked: 5 times
by sumit.sinha » Sun Dec 19, 2010 10:12 am
Image

Answer Choices:
(A) 3/40,000
(B) 3/20,000
(C) 3/4,000
(D) 9/400
(E) 6/130

Source - VeritasPrep Practice Test



Image

Answer Choices:
(A) 3/40,000
(B) 1/3,600
(C) 9/2,000
(D) 1/60
(E) 1/15

Source - GMATPrep Practice Test

OA - Soon

PS: Please click on the image to view the complete question.
Cheers,
Sumit
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
User avatar
Legendary Member
Posts: 866
Joined: Mon Aug 02, 2010 6:46 pm
Location: Gwalior, India
Thanked: 31 times

by goyalsau » Sun Dec 19, 2010 10:51 am
A is the answer
Saurabh Goyal
[email protected]
-------------------------


EveryBody Wants to Win But Nobody wants to prepare for Win.
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 » Sun Dec 19, 2010 10:58 am
Basic principle of both the question is same. (Incidentally the answer is same too! :) )
I'll explain the first one.

Number of possible ways to select two students such that one of them is a junior student and another is a senior student = (Number of possible ways to select a junior student out of 1000)*(Number of possible ways to select a senior student out of 800) = 1000*800

Number of possible ways to select a sibling pair = (Number of possible ways to select one of them out of 60)*(Number of possible ways to select other one of them out of 60) = 60*1

(Number of possible ways to select other one of them out of 60 is 1 because as the first one is already selected other one is fixed for him/her.)

Therefore required probability = 60/(800*1000) = 3/40,000

The correct answer is A.
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
User avatar
Senior | Next Rank: 100 Posts
Posts: 82
Joined: Sat Aug 21, 2010 8:18 am
Location: India
Thanked: 5 times

by sumit.sinha » Sun Dec 19, 2010 11:07 am
Rahul@gurome wrote:Basic principle of both the question is same. (Incidentally the answer is same too! :) )
I'll explain the first one.

Number of possible ways to select two students such that one of them is a junior student and another is a senior student = (Number of possible ways to select a junior student out of 1000)*(Number of possible ways to select a senior student out of 800) = 1000*800

Number of possible ways to select a sibling pair = (Number of possible ways to select one of them out of 60)*(Number of possible ways to select other one of them out of 60) = 60*1

(Number of possible ways to select other one of them out of 60 is 1 because as the first one is already selected other one is fixed for him/her.)

Therefore required probability = 60/(800*1000) = 3/40,000

The correct answer is A.
Thanks for the explanation Rahul.
But dont i need to take into consideration the way/sequence in which i select the siblings??
i.e in one sequence- i first select a sibling form Junior class and then select the matching one from senior class.
and in the 2nd sequence- i first select a sibling form senior class and then select the matching one from junior class
Cheers,
Sumit
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1