Find all School-related info fast with the new School-Specific MBA Forum

It is currently 17 Sep 2014, 01:55

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Permutation/Combination question

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 18 Sep 2008
Posts: 5
Followers: 0

Kudos [?]: 2 [0], given: 0

Permutation/Combination question [#permalink] New post 26 Sep 2008, 22:41
Hi all,

Just came across this question from of the questions banks I found on the internet for counting related problems for the GMAT.
The question reads :
" A computer game has 5 difficulty levels.In each level you can choose among 4 different scenarios, except for the first level, where you can choose among three scenarios only.How many different games are possible ?"

Answer Choices
a)18
b)19
c)20
d)21
e)None of the above.

I thought the answer is e)None of the above.

How did I get to this ?
I thought the solution was pretty simple
Number of possibilities for Level 1 : 3
" Level 2 = 4
" Level 3 =4
" Level 4 = 4
" Level 5= 4

Different number of games possible = 4*4*4*4*3

But, the Answer key says option b)19

Am I missing something here ?
Appreciate any help!

Regards,
dhegde
Kaplan Promo CodeKnewton GMAT Discount CodesVeritas Prep GMAT Discount Codes
SVP
SVP
User avatar
Joined: 07 Nov 2007
Posts: 1829
Location: New York
Followers: 26

Kudos [?]: 451 [0], given: 5

GMAT Tests User
Re: Permutation/Combination question [#permalink] New post 26 Sep 2008, 22:57
dhegdex wrote:
Hi all,

Just came across this question from of the questions banks I found on the internet for counting related problems for the GMAT.
The question reads :
" A computer game has 5 difficulty levels.In each level you can choose among 4 different scenarios, except for the first level, where you can choose among three scenarios only.How many different games are possible ?"

Answer Choices
a)18
b)19
c)20
d)21
e)None of the above.

I thought the answer is e)None of the above.

How did I get to this ?
I thought the solution was pretty simple
Number of possibilities for Level 1 : 3
" Level 2 = 4
" Level 3 =4
" Level 4 = 4
" Level 5= 4

Different number of games possible = 4*4*4*4*3

Why are you multiplying.. you need to add.
= 4+4+4+4+3=19

But, the Answer key says option b)19

Am I missing something here ?
Appreciate any help!

Regards,
dhegde


Possible ways for L1 + possible ways for other levels
= 1*3+4*4=19
_________________

Your attitude determines your altitude
Smiling wins more friends than frowning

1 KUDOS received
GMAT Instructor
avatar
Joined: 24 Jun 2008
Posts: 967
Location: Toronto
Followers: 256

Kudos [?]: 680 [1] , given: 3

GMAT Tests User
Re: Permutation/Combination question [#permalink] New post 26 Sep 2008, 23:12
1
This post received
KUDOS
Clearly they've added to get the answer 19, but I don't see any reason why you'd add here. By my reading of the question, this is a straightforward Fundamental Counting Principle question, and the answer should be 4*4*4*4*3. The wording of the question isn't great, however, and they either have a completely different interpretation of their question that I just don't see, or they've made a fundamental mathematical error in their solution - hard to know which without seeing their explanation. Where specifically is the question from, by the way?

Edit- Actually, rereading the question, and knowing what answer they give, I can guess what they mean. In my reading, I was assuming a player would progress from level one through to level five, choosing one scenario each time. Then there would be 3*4*4*4*4 different games. If instead you simply choose one level and one scenario, and then it's game over, there would be exactly 3+4+4+4+4 = 19 different games. It's a very poorly worded question, open to multiple interpretations, because they never explain just what makes up a 'game'. It's not like anything you'd see on the real GMAT.
_________________

Nov 2011: After years of development, I am now making my advanced Quant books and high-level problem sets available for sale. Contact me at ianstewartgmat at gmail.com for details.

Private GMAT Tutor based in Toronto

SVP
SVP
User avatar
Joined: 07 Nov 2007
Posts: 1829
Location: New York
Followers: 26

Kudos [?]: 451 [0], given: 5

GMAT Tests User
Re: Permutation/Combination question [#permalink] New post 26 Sep 2008, 23:17
IanStewart wrote:
Clearly they've added to get the answer 19, but I don't see any reason why you'd add here. By my reading of the question, this is a straightforward Fundamental Counting Principle question, and the answer should be 4*4*4*4*3. The wording of the question isn't great, however, and they either have a completely different interpretation of their question that I just don't see, or they've made a fundamental mathematical error in their solution - hard to know which without seeing their explanation. Where specifically is the question from, by the way?

Edit- Actually, rereading the question, and knowing what answer they give, I can guess what they mean. In my reading, I was assuming a player would progress from level one through to level five, choosing one scenario each time. Then there would be 3*4*4*4*4 different games. If instead you simply choose one level and one scenario, and then it's game over, there would be exactly 3+4+4+4+4 = 19 different games. It's a very poorly worded question, open to multiple interpretations, and unlike anything you'd see on the real GMAT.


agree with you.. (poorly worded question)
I choose one level and one scenario.
_________________

Your attitude determines your altitude
Smiling wins more friends than frowning

SVP
SVP
avatar
Joined: 17 Jun 2008
Posts: 1579
Followers: 12

Kudos [?]: 183 [0], given: 0

GMAT Tests User
Re: Permutation/Combination question [#permalink] New post 28 Sep 2008, 03:46
Not sure whether this is a GMAT question. It expects you to apply real world understanding. In a computer game, difficulty level is typically chosen before starting the game, hence multiplication is not correct.
Intern
Intern
avatar
Joined: 18 Sep 2008
Posts: 5
Followers: 0

Kudos [?]: 2 [0], given: 0

Re: Permutation/Combination question [#permalink] New post 29 Sep 2008, 08:53
Hey Everyone,
Thanks for the replies.Probability and the like are my weakest areas and hence was practicing stuff from all possible sources .
I imagined that the user would progress from each difficulty level to the next and hence multiplied the possibilities.

Unfortunately the answer key does not provide any explanation.

Regards,
dhegde
Intern
Intern
avatar
Joined: 19 Apr 2008
Posts: 32
Followers: 0

Kudos [?]: 0 [0], given: 22

Re: Permutation/Combination question [#permalink] New post 30 Sep 2008, 03:29
dhegdex wrote:
Hey Everyone,
Thanks for the replies.Probability and the like are my weakest areas and hence was practicing stuff from all possible sources .
I imagined that the user would progress from each difficulty level to the next and hence multiplied the possibilities.

Unfortunately the answer key does not provide any explanation.

Regards,
dhegde


What source did you get the question from?
2 KUDOS received
Intern
Intern
avatar
Joined: 18 Sep 2008
Posts: 5
Followers: 0

Kudos [?]: 2 [2] , given: 0

Re: Permutation/Combination question [#permalink] New post 01 Oct 2008, 00:24
2
This post received
KUDOS
FYI
Attachments

File comment: Attaching the source
Probability and Combinations.doc [99 KiB]
Downloaded 66 times

To download please login or register as a user

Intern
Intern
avatar
Joined: 19 Apr 2008
Posts: 32
Followers: 0

Kudos [?]: 0 [0], given: 22

Re: Permutation/Combination question [#permalink] New post 04 Oct 2008, 15:25
Thanks for the file. These questions remind me of my Business Algebra class.
CEO
CEO
User avatar
Joined: 29 Aug 2007
Posts: 2501
Followers: 53

Kudos [?]: 505 [0], given: 19

GMAT Tests User
Re: Permutation/Combination question [#permalink] New post 04 Oct 2008, 21:12
dhegdex wrote:
Hi all,

Just came across this question from of the questions banks I found on the internet for counting related problems for the GMAT.
The question reads :
" A computer game has 5 difficulty levels.In each level you can choose among 4 different scenarios, except for the first level, where you can choose among three scenarios only.How many different games are possible ?"

Answer Choices
a)18
b)19
c)20
d)21
e)None of the above.

I thought the answer is e)None of the above.

How did I get to this ?
I thought the solution was pretty simple
Number of possibilities for Level 1 : 3
" Level 2 = 4
" Level 3 =4
" Level 4 = 4
" Level 5= 4

Different number of games possible = 4*4*4*4*3

But, the Answer key says option b)19

Am I missing something here ?
Appreciate any help!

Regards,
dhegde


so it is always important to make sure about the resources and their sources. if you have such question as this one, you would be wasting your time and putting yourself in big confusion. Unreliable sources confuse you easily. so some selective sources such as OG, OG Old test materials, Manhattan, Gmat Club forum, and few others are enough for the understanding of whole gmat test....
_________________

Verbal: new-to-the-verbal-forum-please-read-this-first-77546.html
Math: new-to-the-math-forum-please-read-this-first-77764.html
Gmat: everything-you-need-to-prepare-for-the-gmat-revised-77983.html


GT

Manager
Manager
avatar
Joined: 30 Sep 2008
Posts: 113
Followers: 1

Kudos [?]: 9 [0], given: 0

Re: Permutation/Combination question [#permalink] New post 04 Oct 2008, 21:57
dhegdex wrote:
Hi all,

Just came across this question from of the questions banks I found on the internet for counting related problems for the GMAT.
The question reads :
" A computer game has 5 difficulty levels.In each level you can choose among 4 different scenarios, except for the first level, where you can choose among three scenarios only.How many different games are possible ?"

Answer Choices
a)18
b)19
c)20
d)21
e)None of the above.

I thought the answer is e)None of the above.

How did I get to this ?
I thought the solution was pretty simple
Number of possibilities for Level 1 : 3
" Level 2 = 4
" Level 3 =4
" Level 4 = 4
" Level 5= 4

Different number of games possible = 4*4*4*4*3

But, the Answer key says option b)19

Am I missing something here ?
Appreciate any help!

Regards,
dhegde


If you think this question is not about probability, the answer will be very clear.

"How many different games are possible ?" = How many different games at least?
Manager
Manager
avatar
Joined: 10 Aug 2008
Posts: 76
Followers: 1

Kudos [?]: 13 [0], given: 0

Re: Permutation/Combination question [#permalink] New post 05 Oct 2008, 00:12
Here Games means of 1 scenario of 1 level. (Yes language of level is not clear, by the lang it seems i game is consist to cross all the 5 levels)

3 + 4*4 = 19
Re: Permutation/Combination question   [#permalink] 05 Oct 2008, 00:12
    Similar topics Author Replies Last post
Similar
Topics:
1 Experts publish their posts in the topic Permutation and Combination Conceptual Question usadude05 4 21 Mar 2014, 20:47
Experts publish their posts in the topic permutation and combination questions email2vm 2 03 Aug 2013, 02:47
Skipping Permutation/Combination questions ExecMBA2010 1 10 Jan 2010, 08:52
Permutation/ Combination Question belabor 12 10 Dec 2006, 20:37
Display posts from previous: Sort by

Permutation/Combination question

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.