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4 LETTER COMBINATIONS

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Manager
Manager
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Joined: 28 Jan 2004
Posts: 204
Location: India
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Kudos [?]: 10 [0], given: 4

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4 LETTER COMBINATIONS [#permalink] New post 04 Jul 2009, 14:42
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Find the number of four-letter combinations of the letters in the words COLLEGE.

18
28
120
13
94
Intern
Intern
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Joined: 03 Jul 2009
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Re: 4 LETTER COMBINATIONS [#permalink] New post 04 Jul 2009, 15:15
The answer is 18. Check the link below for an explanation.

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

\m/
Manager
Manager
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Joined: 28 Jan 2004
Posts: 204
Location: India
Followers: 2

Kudos [?]: 10 [0], given: 4

GMAT Tests User
Re: 4 LETTER COMBINATIONS [#permalink] New post 04 Jul 2009, 17:45
I got this question from that link only and could not understand the explanation.
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Re: 4 LETTER COMBINATIONS [#permalink] New post 04 Jul 2009, 19:34
mdfrahim wrote:
I got this question from that link only and could not understand the explanation.



That makes two of us :?:
Manager
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Re: 4 LETTER COMBINATIONS [#permalink] New post 05 Jul 2009, 01:36
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
_________________

-talent is the desire to practice-

Re: 4 LETTER COMBINATIONS   [#permalink] 05 Jul 2009, 01:36
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4 LETTER COMBINATIONS

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