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 →

Permutation Q

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Master | Next Rank: 500 Posts
Posts: 355
Joined: Thu Feb 19, 2009 12:42 pmFollowed by: 1 member
Thanked: 2 times
by vineetbatra » Sat Jun 13, 2009 7:34 am
I am a complete daft in Permutation and will need help to understand this rudimentary q.

Janice is decorating her house with christmas lights. Christmas Lights are available in 7 colors, however she has money to buy only 6. What is the maximum number of light decoration she can create if she has to use all the light decorations she has purchased.

Now the OA says, 6! becuase she has to arrange 6 lights. Now my question is she also has the option of buying 6 out of 7 colors, so ideally it should be 6! * number of ways she can buy 6 lights from 7 colors.

Please explain with as much detail as possible.

Really appreciate.

Thanks

Vineet
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
Legendary Member
Posts: 752
Joined: Sun May 17, 2009 11:04 pm
Location: Tokyo
Thanked: 81 times
GMAT Score:680

by tohellandback » Sat Jun 13, 2009 8:05 am
i think you are right. it has to be 6!*7
The powers of two are bloody impolite!!
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 122
Joined: Fri May 22, 2009 10:38 pm
Thanked: 8 times
GMAT Score:700

by rah_pandey » Sat Jun 13, 2009 10:29 pm
The question says "What is the maximum number of light decoration she can create if she has to use all the light decorations she has purchased."

This means we are concerned with the event after the purchase has happened. Thus the answer 6! looks correct. One more advice for Permutation and combination topics. DO NOT USE formulas. Try to develop the logic. Dont try to plug in values in formulaes directly. If you move step by step, your confidence will increase. Formulas are for advanced users.
Basically Combination is the heart and permutation is an extension. Permutation comes into picture once order of selection is important.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 121
Joined: Thu Jun 11, 2009 1:16 am
Thanked: 4 times
GMAT Score:720

by Naruto » Sun Jun 14, 2009 1:52 am
rah_pandey wrote:The question says "What is the maximum number of light decoration she can create if she has to use all the light decorations she has purchased."

This means we are concerned with the event after the purchase has happened. Thus the answer 6! looks correct. One more advice for Permutation and combination topics. DO NOT USE formulas. Try to develop the logic. Dont try to plug in values in formulaes directly. If you move step by step, your confidence will increase. Formulas are for advanced users.
Basically Combination is the heart and permutation is an extension. Permutation comes into picture once order of selection is important.
i agree with you.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 355
Joined: Thu Feb 19, 2009 12:42 pmFollowed by: 1 member
Thanked: 2 times

by vineetbatra » Sun Jun 14, 2009 2:28 pm
makes sense. Thanks rah_pandey.

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