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Six mobsters have arrived at the theater for the premiere of

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Senior Manager
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Joined: 13 Aug 2012
Posts: 464
Concentration: Marketing, Finance
GMAT 1: Q V0
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Kudos [?]: 180 [0], given: 11

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Re: Six mobsters have arrived at the theater for the premiere of [#permalink] New post 27 Dec 2012, 22:05
reply2spg wrote:
Six mobsters have arrived at the theater for the premiere of the film “Goodbuddies.” One of the mobsters, Frankie, is an informer, and he's afraid that another member of his crew, Joey, is on to him. Frankie, wanting to keep Joey in his sights, insists upon standing behind Joey in line at the concession stand, though not necessarily right behind him. How many ways can the six arrange themselves in line such that Frankie’s requirement is satisfied?

A. 6
B. 24
C. 120
D. 360
E. 720


Solution 1:
How many ways to arrange 6 without restriction? 6!
In the total of ways, half of the time J will be behind F or F behind J.
=6!/2 = 360

Solution 2:
To get a little more practice on permutations...

We could count the possibilities of J(...)F.

0 person in between: 5
1 person in between: 4
2 persons in between: 3
3 persons in between: 2
4 persons in between: 1

(5 + 4 + 3 + 2 + 1) * 4! = 360
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Re: Six mobsters have arrived at the theater for the premiere of [#permalink] New post 28 Feb 2013, 09:57
thanks to all for explanation.Finally i understand the concept................
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Re: Six mobsters have arrived at the theater for the premiere of [#permalink] New post 01 Apr 2014, 06:47
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Re: Six mobsters have arrived at the theater for the premiere of   [#permalink] 01 Apr 2014, 06:47
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