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 Post subject: probability questionPosted: Mon May 25, 2009 8:16 am

Joined: Thu May 21, 2009 2:51 pm
Posts: 5
Here's a question from a practice test I took:

In a room of 7 people, 4 people have exactly 1 sibling in the room and 3 have exactly 2 siblings in the room. If 2 individuals are selected at random, what is the probability that they are not siblings?
a) 5/21
b) 3/7
c) 4/7
d) 5/7
e) 16/21

The answer is E, but I don't understand why... because if there are 7 people in the room, there should be 2 pairs of siblings (accounting for four of the people), and one set of triplets.

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 Post subject: Re: probability questionPosted: Mon May 25, 2009 5:29 pm

Joined: Thu Feb 12, 2009 6:32 pm
Posts: 497
Hi Alyssa,

We index this site by Veritas text, page, and problem number. Please provide those references for this problem.

Or, if the problem is from an exam provided by Veritas, please send it as a screen copy to help@veritasprep.com

Thanks.

-- Veritas Help

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