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 Post subject: Picking Friends - Combinotorics Problem
 Post Posted: Sun Jun 12, 2011 7:54 pm 
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Course Students


Posts: 2
Hi,
Can you please explain the below problem in detail to me?

In a room filled with 7 people, 4 people have exactly 1 sibling in the room and 3 people have exactly 2 siblings in the room. If two individuals are selected from the room at random, what is the probability that those two individuals are NOT siblings?

a) 5/21
b) 3/7
c) 4/7
d) 5/7
e) 16/21


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 Post subject: Re: Picking Friends - Combinotorics Problem
 Post Posted: Mon Jun 13, 2011 12:55 pm 
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Course Students


Posts: 98
siblings-problem-combinatorics-t9048.html


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 Post subject: Re: Picking Friends - Combinotorics Problem
 Post Posted: Tue Jun 14, 2011 9:46 pm 
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Course Students


Posts: 2
Thanks george.. That was really helpful...


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 Post subject: Re: Picking Friends - Combinotorics Problem
 Post Posted: Thu Jun 23, 2011 9:21 pm 
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ManhattanGMAT Staff


Posts: 1857
Thanks George!

_________________
Jamie Nelson
ManhattanGMAT Instructor


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