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Updated on: 24 Aug 2013, 08:17
Originally posted by theGame001 on 23 Aug 2013, 08:59.
Last edited by Narenn on 24 Aug 2013, 08:17, edited 1 time in total.
Last edited by Narenn on 24 Aug 2013, 08:17, edited 1 time in total.
OA Added
Kudos
Bookmarks
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
100% (01:39) correct
0%
(00:00)
wrong
based on 6
sessions
History
Date
Time
Result
Not Attempted Yet
The number of ways that 5 Marathi, 3 English and 3 Tamil books be arranged if the books of each language are to be kept together are...
A) 5920
B) 25920
C) 9250
D) 7480
OA: not available
Source: foundation book
A) 5920
B) 25920
C) 9250
D) 7480
OA: not available
Source: foundation book
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
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23 Aug 2013, 10:28
Kudos
Bookmarks
theGame001
Dear theGame001
I'm happy to help.
This doesn't really look like a GMAT Quant question because (a) it only has four answers; (b) the answers are not in numerical order; (c) the numbers are a bit bigger than the GMAT expects folks to do without a calculator; and (d) the question is not completely unambiguous. I would not recommend relying on questions from this source to prepare you adequately for the GMAT.
For the math behind these calculations, see:
https://magoosh.com/gmat/2012/gmat-permu ... binations/
https://magoosh.com/gmat/2012/gmat-math- ... binations/
https://magoosh.com/gmat/2012/gmat-factorials/
https://magoosh.com/gmat/2012/gmat-quant-how-to-count/
I will assume what they mean is that we could have the three groups ---- (5 Marathi books) and (3 English books) and (3 Tamil books) in any order. That's a set of three, which can be arranged in 3! = 6 ways.
Within the 5 Marathi books, there are 5! = 120 orders.
Within the 3 English books, there are 6! = 6 orders.
Within the 3 Tamil books, there are 6! = 6 orders.
The Fundamental Counting Principle tells us to multiply all these:
total = 120*6*6*6 = 25,920
Answer = (B)
Does all this make sense?
Mike
23 Aug 2013, 11:52
Kudos
Bookmarks
Thanks Mike, this was a question from one of the foundation books.
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
