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 →

Proabity: Concept

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 271
Joined: Tue May 22, 2012 3:22 amFollowed by: 3 members
Thanked: 7 times
by \'manpreet singh » Wed Nov 14, 2012 10:22 pm
q.1 If seven people board an airport shuttle with only three available seats, how
many different seating arrangements are possible? (Assume that three of
the seven will actually take the seats.)

q.2 If three of seven standby passengers are selected for a flight, how many
different combinations of standby passengers can be selected?

Please explain how are these 2 questions different?I need a comparison as i feel a little unclear about the concept here?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
User avatar
Master | Next Rank: 500 Posts
Posts: 435
Joined: Mon Mar 15, 2010 6:15 amFollowed by: 1 member
Thanked: 32 times

by eaakbari » Wed Nov 14, 2012 11:38 pm
If I asked you to cite an example on the difference between permutations & combinations, your question is the perfect answer.

In (1) , they are asking for the arrangement ABC is different from BCA. They keyword here is 'arrangement'. Thats when you know its a permutation.
Answer = n(P)r

In (2), BCA is no different from ABC. Hence its a combination.
Answer = n(C)r
Whether you think you can or can't, you're right.
- Henry Ford
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 271
Joined: Tue May 22, 2012 3:22 amFollowed by: 3 members
Thanked: 7 times

by \'manpreet singh » Thu Nov 15, 2012 12:01 am
eaakbari wrote:If I asked you to cite an example on the difference between permutations & combinations, your question is the perfect answer.

In (1) , they are asking for the arrangement ABC is different from BCA. They keyword here is 'arrangement'. Thats when you know its a permutation.
Answer = n(P)r

In (2), BCA is no different from ABC. Hence its a combination.
Answer = n(C)r

Thanks for your quick repsonse,
But that's whats confusing me.....forget about permutation and combination.If we take to counting method.How are you saying that in first case ABC is different from BCA, meaning they are distinguihable from one another and in second question ABC is same as BCA,meaning they are undistinguishable . How are you conculding these two statements, i basically need clarity on that.

=======================================
Singh
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1