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probability office building

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probability office building [#permalink] New post 02 Jun 2009, 03:49
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A certain company assigns employees to offices in such a way that some of the offices can be empty and more than one employee can be assigned to an office. In how many ways can the company assign 3 employees to 2 different offices?
A. 5
B. 6
C. 7
D. 8
E. 9
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Re: probability office building [#permalink] New post 04 Jun 2009, 09:08
9:
office [#1,#2]: [0,3], [1,2] - [a bc], [b ac], [c ab], [2,1] x3, [3,0]

oops - yes 8..

Last edited by osnat on 06 Jun 2009, 07:01, edited 1 time in total.
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Schools: Anderson '15, Insead '13
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Re: probability office building [#permalink] New post 04 Jun 2009, 11:06
IMO D

3C0+3C1+3C2+3C3
=1+3+3+1
=8
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Re: probability office building   [#permalink] 04 Jun 2009, 11:06
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