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# 4 LETTER COMBINATIONS

Author Message
Manager
Joined: 28 Jan 2004
Posts: 201
Location: India

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04 Jul 2009, 15:42
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

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Find the number of four-letter combinations of the letters in the words COLLEGE.

18
28
120
13
94

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

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Intern
Joined: 03 Jul 2009
Posts: 2

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04 Jul 2009, 16:15

http://mathforum.org/library/drmath/view/56204.html

\m/
Manager
Joined: 28 Jan 2004
Posts: 201
Location: India

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04 Jul 2009, 18:45
I got this question from that link only and could not understand the explanation.
Intern
Joined: 03 Jul 2009
Posts: 2

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04 Jul 2009, 20:34
mdfrahim wrote:
I got this question from that link only and could not understand the explanation.

That makes two of us
Manager
Joined: 12 Apr 2009
Posts: 205

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05 Jul 2009, 02:36
zeppelin wrote:
mdfrahim wrote:
I got this question from that link only and could not understand the explanation.

That makes two of us :

Nice brain teaser but this is not reflective of a gmat question.

but using GMAT concepts

let us first find the permutation of 4 letters from the word college = 7!/(7-4)! = 7!/3! = 840. So there are 840 different permutations.

From these combinations we need to discount half of the occurences where both L's and both E's occur. I'm a bit stumped here.

If someone can shed light on this train of thought that would be kind.

che,
dg

--== Message from GMAT Club Team ==--

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Re: 4 LETTER COMBINATIONS   [#permalink] 05 Jul 2009, 02:36
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# 4 LETTER COMBINATIONS

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