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Re: Joe is in a group consisting of N people (N > 4). [#permalink]
Another way if you don't want to solve the combination!

Let N=5 (which include joe)
Now,

Ways of picking 3 people = joe and (2 others out of 4) = 1 x 4C2
Ways of picking 3 people out of the total = 5C3

Required prob. is 3/5 which we can see is 3/N
Hence, Option C
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Re: Joe is in a group consisting of N people (N > 4). [#permalink]
Hello from the GRE Prep Club BumpBot!

Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Joe is in a group consisting of N people (N > 4). [#permalink]
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